diff --git a/homeassistant/components/adguard/sensor.py b/homeassistant/components/adguard/sensor.py
index e5618282a97..9d0d5245d80 100644
--- a/homeassistant/components/adguard/sensor.py
+++ b/homeassistant/components/adguard/sensor.py
@@ -11,6 +11,7 @@ from homeassistant.components.adguard.const import (
     DOMAIN,
 )
 from homeassistant.config_entries import ConfigEntry
+from homeassistant.const import TIME_MILLISECONDS
 from homeassistant.exceptions import PlatformNotReady
 from homeassistant.helpers.typing import HomeAssistantType
 
@@ -206,7 +207,7 @@ class AdGuardHomeAverageProcessingTimeSensor(AdGuardHomeSensor):
             "AdGuard Average Processing Speed",
             "mdi:speedometer",
             "average_speed",
-            "ms",
+            TIME_MILLISECONDS,
         )
 
     async def _adguard_update(self) -> None:
diff --git a/homeassistant/components/apcupsd/sensor.py b/homeassistant/components/apcupsd/sensor.py
index 255eb1624ff..7947ba75999 100644
--- a/homeassistant/components/apcupsd/sensor.py
+++ b/homeassistant/components/apcupsd/sensor.py
@@ -6,7 +6,13 @@ import voluptuous as vol
 
 from homeassistant.components import apcupsd
 from homeassistant.components.sensor import PLATFORM_SCHEMA
-from homeassistant.const import CONF_RESOURCES, POWER_WATT, TEMP_CELSIUS
+from homeassistant.const import (
+    CONF_RESOURCES,
+    POWER_WATT,
+    TEMP_CELSIUS,
+    TIME_MINUTES,
+    TIME_SECONDS,
+)
 import homeassistant.helpers.config_validation as cv
 from homeassistant.helpers.entity import Entity
 
@@ -84,8 +90,8 @@ SENSOR_TYPES = {
 
 SPECIFIC_UNITS = {"ITEMP": TEMP_CELSIUS}
 INFERRED_UNITS = {
-    " Minutes": "min",
-    " Seconds": "sec",
+    " Minutes": TIME_MINUTES,
+    " Seconds": TIME_SECONDS,
     " Percent": "%",
     " Volts": "V",
     " Ampere": "A",
diff --git a/homeassistant/components/bitcoin/sensor.py b/homeassistant/components/bitcoin/sensor.py
index 6a8651be6dc..cf2b76bf25f 100644
--- a/homeassistant/components/bitcoin/sensor.py
+++ b/homeassistant/components/bitcoin/sensor.py
@@ -6,7 +6,13 @@ from blockchain import exchangerates, statistics
 import voluptuous as vol
 
 from homeassistant.components.sensor import PLATFORM_SCHEMA
-from homeassistant.const import ATTR_ATTRIBUTION, CONF_CURRENCY, CONF_DISPLAY_OPTIONS
+from homeassistant.const import (
+    ATTR_ATTRIBUTION,
+    CONF_CURRENCY,
+    CONF_DISPLAY_OPTIONS,
+    TIME_MINUTES,
+    TIME_SECONDS,
+)
 import homeassistant.helpers.config_validation as cv
 from homeassistant.helpers.entity import Entity
 
@@ -27,9 +33,9 @@ OPTION_TYPES = {
     "btc_mined": ["Mined", "BTC"],
     "trade_volume_usd": ["Trade volume", "USD"],
     "difficulty": ["Difficulty", None],
-    "minutes_between_blocks": ["Time between Blocks", "min"],
+    "minutes_between_blocks": ["Time between Blocks", TIME_MINUTES],
     "number_of_transactions": ["No. of Transactions", None],
-    "hash_rate": ["Hash rate", "PH/s"],
+    "hash_rate": ["Hash rate", f"PH/{TIME_SECONDS}"],
     "timestamp": ["Timestamp", None],
     "mined_blocks": ["Mined Blocks", None],
     "blocks_size": ["Block size", None],
diff --git a/homeassistant/components/bizkaibus/sensor.py b/homeassistant/components/bizkaibus/sensor.py
index 931fbbb834d..c58873473d5 100644
--- a/homeassistant/components/bizkaibus/sensor.py
+++ b/homeassistant/components/bizkaibus/sensor.py
@@ -6,7 +6,7 @@ from bizkaibus.bizkaibus import BizkaibusData
 import voluptuous as vol
 
 from homeassistant.components.sensor import PLATFORM_SCHEMA
-from homeassistant.const import CONF_NAME
+from homeassistant.const import CONF_NAME, TIME_MINUTES
 import homeassistant.helpers.config_validation as cv
 from homeassistant.helpers.entity import Entity
 
@@ -62,7 +62,7 @@ class BizkaibusSensor(Entity):
     @property
     def unit_of_measurement(self):
         """Return the unit of measurement of the sensor."""
-        return "minutes"
+        return TIME_MINUTES
 
     def update(self):
         """Get the latest data from the webservice."""
diff --git a/homeassistant/components/bmw_connected_drive/sensor.py b/homeassistant/components/bmw_connected_drive/sensor.py
index 3c40900bed8..7fb3da8b883 100644
--- a/homeassistant/components/bmw_connected_drive/sensor.py
+++ b/homeassistant/components/bmw_connected_drive/sensor.py
@@ -7,6 +7,7 @@ from homeassistant.const import (
     CONF_UNIT_SYSTEM_IMPERIAL,
     LENGTH_KILOMETERS,
     LENGTH_MILES,
+    TIME_HOURS,
     VOLUME_GALLONS,
     VOLUME_LITERS,
 )
@@ -24,7 +25,7 @@ ATTR_TO_HA_METRIC = {
     "remaining_range_fuel": ["mdi:map-marker-distance", LENGTH_KILOMETERS],
     "max_range_electric": ["mdi:map-marker-distance", LENGTH_KILOMETERS],
     "remaining_fuel": ["mdi:gas-station", VOLUME_LITERS],
-    "charging_time_remaining": ["mdi:update", "h"],
+    "charging_time_remaining": ["mdi:update", TIME_HOURS],
     "charging_status": ["mdi:battery-charging", None],
     # No icon as this is dealt with directly as a special case in icon()
     "charging_level_hv": [None, "%"],
@@ -37,7 +38,7 @@ ATTR_TO_HA_IMPERIAL = {
     "remaining_range_fuel": ["mdi:map-marker-distance", LENGTH_MILES],
     "max_range_electric": ["mdi:map-marker-distance", LENGTH_MILES],
     "remaining_fuel": ["mdi:gas-station", VOLUME_GALLONS],
-    "charging_time_remaining": ["mdi:update", "h"],
+    "charging_time_remaining": ["mdi:update", TIME_HOURS],
     "charging_status": ["mdi:battery-charging", None],
     # No icon as this is dealt with directly as a special case in icon()
     "charging_level_hv": [None, "%"],
diff --git a/homeassistant/components/bom/sensor.py b/homeassistant/components/bom/sensor.py
index bd57e20edaa..0981f1b0a86 100644
--- a/homeassistant/components/bom/sensor.py
+++ b/homeassistant/components/bom/sensor.py
@@ -20,6 +20,7 @@ from homeassistant.const import (
     CONF_MONITORED_CONDITIONS,
     CONF_NAME,
     TEMP_CELSIUS,
+    TIME_HOURS,
 )
 import homeassistant.helpers.config_validation as cv
 from homeassistant.helpers.entity import Entity
@@ -59,7 +60,7 @@ SENSOR_TYPES = {
     "cloud_type_id": ["Cloud Type ID", None],
     "cloud_type": ["Cloud Type", None],
     "delta_t": ["Delta Temp C", TEMP_CELSIUS],
-    "gust_kmh": ["Wind Gust kmh", "km/h"],
+    "gust_kmh": ["Wind Gust kmh", f"km/{TIME_HOURS}"],
     "gust_kt": ["Wind Gust kt", "kt"],
     "air_temp": ["Air Temp C", TEMP_CELSIUS],
     "dewpt": ["Dew Point C", TEMP_CELSIUS],
@@ -76,7 +77,7 @@ SENSOR_TYPES = {
     "vis_km": ["Visability km", "km"],
     "weather": ["Weather", None],
     "wind_dir": ["Wind Direction", None],
-    "wind_spd_kmh": ["Wind Speed kmh", "km/h"],
+    "wind_spd_kmh": ["Wind Speed kmh", f"km/{TIME_HOURS}"],
     "wind_spd_kt": ["Wind Speed kt", "kt"],
 }
 
diff --git a/homeassistant/components/brother/const.py b/homeassistant/components/brother/const.py
index fdb7cd82b9c..d3b7c5e2a78 100644
--- a/homeassistant/components/brother/const.py
+++ b/homeassistant/components/brother/const.py
@@ -1,4 +1,6 @@
 """Constants for Brother integration."""
+from homeassistant.const import TIME_DAYS
+
 ATTR_BELT_UNIT_REMAINING_LIFE = "belt_unit_remaining_life"
 ATTR_BLACK_INK_REMAINING = "black_ink_remaining"
 ATTR_BLACK_TONER_REMAINING = "black_toner_remaining"
@@ -28,7 +30,6 @@ ATTR_YELLOW_TONER_REMAINING = "yellow_toner_remaining"
 DOMAIN = "brother"
 
 UNIT_PAGES = "p"
-UNIT_DAYS = "days"
 UNIT_PERCENT = "%"
 
 PRINTER_TYPES = ["laser", "ink"]
@@ -127,6 +128,6 @@ SENSOR_TYPES = {
     ATTR_UPTIME: {
         ATTR_ICON: "mdi:timer",
         ATTR_LABEL: ATTR_UPTIME.title(),
-        ATTR_UNIT: UNIT_DAYS,
+        ATTR_UNIT: TIME_DAYS,
     },
 }
diff --git a/homeassistant/components/buienradar/sensor.py b/homeassistant/components/buienradar/sensor.py
index f642fc2e249..fa3e7fd343b 100644
--- a/homeassistant/components/buienradar/sensor.py
+++ b/homeassistant/components/buienradar/sensor.py
@@ -28,6 +28,7 @@ from homeassistant.const import (
     CONF_MONITORED_CONDITIONS,
     CONF_NAME,
     TEMP_CELSIUS,
+    TIME_HOURS,
 )
 import homeassistant.helpers.config_validation as cv
 from homeassistant.helpers.entity import Entity
@@ -67,18 +68,18 @@ SENSOR_TYPES = {
     "humidity": ["Humidity", "%", "mdi:water-percent"],
     "temperature": ["Temperature", TEMP_CELSIUS, "mdi:thermometer"],
     "groundtemperature": ["Ground temperature", TEMP_CELSIUS, "mdi:thermometer"],
-    "windspeed": ["Wind speed", "km/h", "mdi:weather-windy"],
+    "windspeed": ["Wind speed", f"km/{TIME_HOURS}", "mdi:weather-windy"],
     "windforce": ["Wind force", "Bft", "mdi:weather-windy"],
     "winddirection": ["Wind direction", None, "mdi:compass-outline"],
     "windazimuth": ["Wind direction azimuth", "°", "mdi:compass-outline"],
     "pressure": ["Pressure", "hPa", "mdi:gauge"],
     "visibility": ["Visibility", "km", None],
-    "windgust": ["Wind gust", "km/h", "mdi:weather-windy"],
-    "precipitation": ["Precipitation", "mm/h", "mdi:weather-pouring"],
+    "windgust": ["Wind gust", f"km/{TIME_HOURS}", "mdi:weather-windy"],
+    "precipitation": ["Precipitation", f"mm/{TIME_HOURS}", "mdi:weather-pouring"],
     "irradiance": ["Irradiance", "W/m2", "mdi:sunglasses"],
     "precipitation_forecast_average": [
         "Precipitation forecast average",
-        "mm/h",
+        f"mm/{TIME_HOURS}",
         "mdi:weather-pouring",
     ],
     "precipitation_forecast_total": [
@@ -132,11 +133,11 @@ SENSOR_TYPES = {
     "windforce_3d": ["Wind force 3d", "Bft", "mdi:weather-windy"],
     "windforce_4d": ["Wind force 4d", "Bft", "mdi:weather-windy"],
     "windforce_5d": ["Wind force 5d", "Bft", "mdi:weather-windy"],
-    "windspeed_1d": ["Wind speed 1d", "km/h", "mdi:weather-windy"],
-    "windspeed_2d": ["Wind speed 2d", "km/h", "mdi:weather-windy"],
-    "windspeed_3d": ["Wind speed 3d", "km/h", "mdi:weather-windy"],
-    "windspeed_4d": ["Wind speed 4d", "km/h", "mdi:weather-windy"],
-    "windspeed_5d": ["Wind speed 5d", "km/h", "mdi:weather-windy"],
+    "windspeed_1d": ["Wind speed 1d", f"km/{TIME_HOURS}", "mdi:weather-windy"],
+    "windspeed_2d": ["Wind speed 2d", f"km/{TIME_HOURS}", "mdi:weather-windy"],
+    "windspeed_3d": ["Wind speed 3d", f"km/{TIME_HOURS}", "mdi:weather-windy"],
+    "windspeed_4d": ["Wind speed 4d", f"km/{TIME_HOURS}", "mdi:weather-windy"],
+    "windspeed_5d": ["Wind speed 5d", f"km/{TIME_HOURS}", "mdi:weather-windy"],
     "winddirection_1d": ["Wind direction 1d", None, "mdi:compass-outline"],
     "winddirection_2d": ["Wind direction 2d", None, "mdi:compass-outline"],
     "winddirection_3d": ["Wind direction 3d", None, "mdi:compass-outline"],
diff --git a/homeassistant/components/cert_expiry/sensor.py b/homeassistant/components/cert_expiry/sensor.py
index 3a76575dfdd..b4437ca5834 100644
--- a/homeassistant/components/cert_expiry/sensor.py
+++ b/homeassistant/components/cert_expiry/sensor.py
@@ -13,6 +13,7 @@ from homeassistant.const import (
     CONF_NAME,
     CONF_PORT,
     EVENT_HOMEASSISTANT_START,
+    TIME_DAYS,
 )
 from homeassistant.core import callback
 import homeassistant.helpers.config_validation as cv
@@ -85,7 +86,7 @@ class SSLCertificate(Entity):
     @property
     def unit_of_measurement(self):
         """Return the unit this state is expressed in."""
-        return "days"
+        return TIME_DAYS
 
     @property
     def state(self):
diff --git a/homeassistant/components/comfoconnect/sensor.py b/homeassistant/components/comfoconnect/sensor.py
index 3e3507ea48d..1d189508960 100644
--- a/homeassistant/components/comfoconnect/sensor.py
+++ b/homeassistant/components/comfoconnect/sensor.py
@@ -31,6 +31,8 @@ from homeassistant.const import (
     DEVICE_CLASS_TEMPERATURE,
     POWER_WATT,
     TEMP_CELSIUS,
+    TIME_DAYS,
+    TIME_HOURS,
 )
 import homeassistant.helpers.config_validation as cv
 from homeassistant.helpers.dispatcher import async_dispatcher_connect
@@ -156,14 +158,14 @@ SENSOR_TYPES = {
     ATTR_AIR_FLOW_SUPPLY: {
         ATTR_DEVICE_CLASS: None,
         ATTR_LABEL: "Supply airflow",
-        ATTR_UNIT: "m³/h",
+        ATTR_UNIT: f"m³/{TIME_HOURS}",
         ATTR_ICON: "mdi:fan",
         ATTR_ID: SENSOR_FAN_SUPPLY_FLOW,
     },
     ATTR_AIR_FLOW_EXHAUST: {
         ATTR_DEVICE_CLASS: None,
         ATTR_LABEL: "Exhaust airflow",
-        ATTR_UNIT: "m³/h",
+        ATTR_UNIT: f"m³/{TIME_HOURS}",
         ATTR_ICON: "mdi:fan",
         ATTR_ID: SENSOR_FAN_EXHAUST_FLOW,
     },
@@ -177,7 +179,7 @@ SENSOR_TYPES = {
     ATTR_DAYS_TO_REPLACE_FILTER: {
         ATTR_DEVICE_CLASS: None,
         ATTR_LABEL: "Days to replace filter",
-        ATTR_UNIT: "days",
+        ATTR_UNIT: TIME_DAYS,
         ATTR_ICON: "mdi:calendar",
         ATTR_ID: SENSOR_DAYS_TO_REPLACE_FILTER,
     },
@@ -194,7 +196,7 @@ PLATFORM_SCHEMA = PLATFORM_SCHEMA.extend(
     {
         vol.Optional(CONF_RESOURCES, default=[]): vol.All(
             cv.ensure_list, [vol.In(SENSOR_TYPES)]
-        ),
+        )
     }
 )
 
@@ -229,7 +231,7 @@ class ComfoConnectSensor(Entity):
     async def async_added_to_hass(self):
         """Register for sensor updates."""
         _LOGGER.debug(
-            "Registering for sensor %s (%d)", self._sensor_type, self._sensor_id,
+            "Registering for sensor %s (%d)", self._sensor_type, self._sensor_id
         )
         async_dispatcher_connect(
             self.hass,
diff --git a/homeassistant/components/darksky/sensor.py b/homeassistant/components/darksky/sensor.py
index 9f99b37a201..cecff626813 100644
--- a/homeassistant/components/darksky/sensor.py
+++ b/homeassistant/components/darksky/sensor.py
@@ -15,6 +15,8 @@ from homeassistant.const import (
     CONF_MONITORED_CONDITIONS,
     CONF_NAME,
     CONF_SCAN_INTERVAL,
+    TIME_HOURS,
+    TIME_SECONDS,
     UNIT_UV_INDEX,
 )
 import homeassistant.helpers.config_validation as cv
@@ -99,11 +101,11 @@ SENSOR_TYPES = {
     ],
     "precip_intensity": [
         "Precip Intensity",
-        "mm/h",
+        f"mm/{TIME_HOURS}",
         "in",
-        "mm/h",
-        "mm/h",
-        "mm/h",
+        f"mm/{TIME_HOURS}",
+        f"mm/{TIME_HOURS}",
+        f"mm/{TIME_HOURS}",
         "mdi:weather-rainy",
         ["currently", "minutely", "hourly", "daily"],
     ],
@@ -159,9 +161,9 @@ SENSOR_TYPES = {
     ],
     "wind_speed": [
         "Wind Speed",
-        "m/s",
+        f"m/{TIME_SECONDS}",
         "mph",
-        "km/h",
+        f"km/{TIME_HOURS}",
         "mph",
         "mph",
         "mdi:weather-windy",
@@ -179,9 +181,9 @@ SENSOR_TYPES = {
     ],
     "wind_gust": [
         "Wind Gust",
-        "m/s",
+        f"m/{TIME_SECONDS}",
         "mph",
-        "km/h",
+        f"km/{TIME_HOURS}",
         "mph",
         "mph",
         "mdi:weather-windy-variant",
@@ -319,11 +321,11 @@ SENSOR_TYPES = {
     ],
     "precip_intensity_max": [
         "Daily Max Precip Intensity",
-        "mm/h",
+        f"mm/{TIME_HOURS}",
         "in",
-        "mm/h",
-        "mm/h",
-        "mm/h",
+        f"mm/{TIME_HOURS}",
+        f"mm/{TIME_HOURS}",
+        f"mm/{TIME_HOURS}",
         "mdi:thermometer",
         ["daily"],
     ],
diff --git a/homeassistant/components/derivative/sensor.py b/homeassistant/components/derivative/sensor.py
index 5e68b268685..202c5885887 100644
--- a/homeassistant/components/derivative/sensor.py
+++ b/homeassistant/components/derivative/sensor.py
@@ -11,6 +11,10 @@ from homeassistant.const import (
     CONF_SOURCE,
     STATE_UNAVAILABLE,
     STATE_UNKNOWN,
+    TIME_DAYS,
+    TIME_HOURS,
+    TIME_MINUTES,
+    TIME_SECONDS,
 )
 from homeassistant.core import callback
 import homeassistant.helpers.config_validation as cv
@@ -42,7 +46,12 @@ UNIT_PREFIXES = {
 }
 
 # SI Time prefixes
-UNIT_TIME = {"s": 1, "min": 60, "h": 60 * 60, "d": 24 * 60 * 60}
+UNIT_TIME = {
+    TIME_SECONDS: 1,
+    TIME_MINUTES: 60,
+    TIME_HOURS: 60 * 60,
+    TIME_DAYS: 24 * 60 * 60,
+}
 
 ICON = "mdi:chart-line"
 
@@ -55,7 +64,7 @@ PLATFORM_SCHEMA = PLATFORM_SCHEMA.extend(
         vol.Required(CONF_SOURCE): cv.entity_id,
         vol.Optional(CONF_ROUND_DIGITS, default=DEFAULT_ROUND): vol.Coerce(int),
         vol.Optional(CONF_UNIT_PREFIX, default=None): vol.In(UNIT_PREFIXES),
-        vol.Optional(CONF_UNIT_TIME, default="h"): vol.In(UNIT_TIME),
+        vol.Optional(CONF_UNIT_TIME, default=TIME_HOURS): vol.In(UNIT_TIME),
         vol.Optional(CONF_UNIT): cv.string,
         vol.Optional(CONF_TIME_WINDOW, default=DEFAULT_TIME_WINDOW): cv.time_period,
     }
diff --git a/homeassistant/components/dsmr/sensor.py b/homeassistant/components/dsmr/sensor.py
index 54c8e3e29b2..6ffc4a3106c 100644
--- a/homeassistant/components/dsmr/sensor.py
+++ b/homeassistant/components/dsmr/sensor.py
@@ -9,7 +9,12 @@ import serial
 import voluptuous as vol
 
 from homeassistant.components.sensor import PLATFORM_SCHEMA
-from homeassistant.const import CONF_HOST, CONF_PORT, EVENT_HOMEASSISTANT_STOP
+from homeassistant.const import (
+    CONF_HOST,
+    CONF_PORT,
+    EVENT_HOMEASSISTANT_STOP,
+    TIME_HOURS,
+)
 from homeassistant.core import CoreState
 import homeassistant.helpers.config_validation as cv
 from homeassistant.helpers.entity import Entity
@@ -303,4 +308,4 @@ class DerivativeDSMREntity(DSMREntity):
         """Return the unit of measurement of this entity, per hour, if any."""
         unit = self.get_dsmr_object_attr("unit")
         if unit:
-            return unit + "/h"
+            return f"{unit}/{TIME_HOURS}"
diff --git a/homeassistant/components/dublin_bus_transport/sensor.py b/homeassistant/components/dublin_bus_transport/sensor.py
index b517ecf6466..5de0b62a4a9 100644
--- a/homeassistant/components/dublin_bus_transport/sensor.py
+++ b/homeassistant/components/dublin_bus_transport/sensor.py
@@ -11,7 +11,7 @@ import requests
 import voluptuous as vol
 
 from homeassistant.components.sensor import PLATFORM_SCHEMA
-from homeassistant.const import ATTR_ATTRIBUTION, CONF_NAME
+from homeassistant.const import ATTR_ATTRIBUTION, CONF_NAME, TIME_MINUTES
 import homeassistant.helpers.config_validation as cv
 from homeassistant.helpers.entity import Entity
 import homeassistant.util.dt as dt_util
@@ -109,7 +109,7 @@ class DublinPublicTransportSensor(Entity):
     @property
     def unit_of_measurement(self):
         """Return the unit this state is expressed in."""
-        return "min"
+        return TIME_MINUTES
 
     @property
     def icon(self):
diff --git a/homeassistant/components/dyson/sensor.py b/homeassistant/components/dyson/sensor.py
index 2fdd3cd6c1f..870086e7550 100644
--- a/homeassistant/components/dyson/sensor.py
+++ b/homeassistant/components/dyson/sensor.py
@@ -4,7 +4,7 @@ import logging
 from libpurecool.dyson_pure_cool import DysonPureCool
 from libpurecool.dyson_pure_cool_link import DysonPureCoolLink
 
-from homeassistant.const import STATE_OFF, TEMP_CELSIUS
+from homeassistant.const import STATE_OFF, TEMP_CELSIUS, TIME_HOURS
 from homeassistant.helpers.entity import Entity
 
 from . import DYSON_DEVICES
@@ -12,7 +12,7 @@ from . import DYSON_DEVICES
 SENSOR_UNITS = {
     "air_quality": None,
     "dust": None,
-    "filter_life": "hours",
+    "filter_life": TIME_HOURS,
     "humidity": "%",
 }
 
diff --git a/homeassistant/components/ebox/sensor.py b/homeassistant/components/ebox/sensor.py
index f1221bd1e77..208ffb99543 100644
--- a/homeassistant/components/ebox/sensor.py
+++ b/homeassistant/components/ebox/sensor.py
@@ -17,6 +17,7 @@ from homeassistant.const import (
     CONF_PASSWORD,
     CONF_USERNAME,
     DATA_GIGABITS,
+    TIME_DAYS,
 )
 from homeassistant.exceptions import PlatformNotReady
 import homeassistant.helpers.config_validation as cv
@@ -26,7 +27,6 @@ from homeassistant.util import Throttle
 _LOGGER = logging.getLogger(__name__)
 
 PRICE = "CAD"
-DAYS = "days"
 PERCENT = "%"
 
 DEFAULT_NAME = "EBox"
@@ -39,7 +39,7 @@ SENSOR_TYPES = {
     "usage": ["Usage", PERCENT, "mdi:percent"],
     "balance": ["Balance", PRICE, "mdi:square-inc-cash"],
     "limit": ["Data limit", DATA_GIGABITS, "mdi:download"],
-    "days_left": ["Days left", DAYS, "mdi:calendar-today"],
+    "days_left": ["Days left", TIME_DAYS, "mdi:calendar-today"],
     "before_offpeak_download": [
         "Download before offpeak",
         DATA_GIGABITS,
diff --git a/homeassistant/components/ebusd/const.py b/homeassistant/components/ebusd/const.py
index ec097a153c9..10ed0b68e87 100644
--- a/homeassistant/components/ebusd/const.py
+++ b/homeassistant/components/ebusd/const.py
@@ -1,8 +1,12 @@
 """Constants for ebus component."""
-from homeassistant.const import ENERGY_KILO_WATT_HOUR, PRESSURE_BAR, TEMP_CELSIUS
+from homeassistant.const import (
+    ENERGY_KILO_WATT_HOUR,
+    PRESSURE_BAR,
+    TEMP_CELSIUS,
+    TIME_SECONDS,
+)
 
 DOMAIN = "ebusd"
-TIME_SECONDS = "seconds"
 
 #  SensorTypes from ebusdpy module :
 #  0='decimal', 1='time-schedule', 2='switch', 3='string', 4='value;status'
diff --git a/homeassistant/components/entur_public_transport/sensor.py b/homeassistant/components/entur_public_transport/sensor.py
index 2ecae21824e..156a0e601b4 100644
--- a/homeassistant/components/entur_public_transport/sensor.py
+++ b/homeassistant/components/entur_public_transport/sensor.py
@@ -12,6 +12,7 @@ from homeassistant.const import (
     CONF_LONGITUDE,
     CONF_NAME,
     CONF_SHOW_ON_MAP,
+    TIME_MINUTES,
 )
 from homeassistant.helpers.aiohttp_client import async_get_clientsession
 import homeassistant.helpers.config_validation as cv
@@ -183,7 +184,7 @@ class EnturPublicTransportSensor(Entity):
     @property
     def unit_of_measurement(self) -> str:
         """Return the unit this state is expressed in."""
-        return "min"
+        return TIME_MINUTES
 
     @property
     def icon(self) -> str:
diff --git a/homeassistant/components/fido/sensor.py b/homeassistant/components/fido/sensor.py
index 9f2eeb9bd7c..951d13dadb4 100644
--- a/homeassistant/components/fido/sensor.py
+++ b/homeassistant/components/fido/sensor.py
@@ -18,6 +18,7 @@ from homeassistant.const import (
     CONF_PASSWORD,
     CONF_USERNAME,
     DATA_KILOBITS,
+    TIME_MINUTES,
 )
 import homeassistant.helpers.config_validation as cv
 from homeassistant.helpers.entity import Entity
@@ -27,7 +28,6 @@ _LOGGER = logging.getLogger(__name__)
 
 PRICE = "CAD"
 MESSAGES = "messages"
-MINUTES = "minutes"
 
 DEFAULT_NAME = "Fido"
 
@@ -49,12 +49,12 @@ SENSOR_TYPES = {
     "text_int_used": ["International text used", MESSAGES, "mdi:message-alert"],
     "text_int_limit": ["International text limit", MESSAGES, "mdi:message-alert"],
     "text_int_remaining": ["International remaining", MESSAGES, "mdi:message-alert"],
-    "talk_used": ["Talk used", MINUTES, "mdi:cellphone"],
-    "talk_limit": ["Talk limit", MINUTES, "mdi:cellphone"],
-    "talk_remaining": ["Talk remaining", MINUTES, "mdi:cellphone"],
-    "other_talk_used": ["Other Talk used", MINUTES, "mdi:cellphone"],
-    "other_talk_limit": ["Other Talk limit", MINUTES, "mdi:cellphone"],
-    "other_talk_remaining": ["Other Talk remaining", MINUTES, "mdi:cellphone"],
+    "talk_used": ["Talk used", TIME_MINUTES, "mdi:cellphone"],
+    "talk_limit": ["Talk limit", TIME_MINUTES, "mdi:cellphone"],
+    "talk_remaining": ["Talk remaining", TIME_MINUTES, "mdi:cellphone"],
+    "other_talk_used": ["Other Talk used", TIME_MINUTES, "mdi:cellphone"],
+    "other_talk_limit": ["Other Talk limit", TIME_MINUTES, "mdi:cellphone"],
+    "other_talk_remaining": ["Other Talk remaining", TIME_MINUTES, "mdi:cellphone"],
 }
 
 PLATFORM_SCHEMA = PLATFORM_SCHEMA.extend(
diff --git a/homeassistant/components/fitbit/sensor.py b/homeassistant/components/fitbit/sensor.py
index 5ddb63ef899..8c17e3b9c4c 100644
--- a/homeassistant/components/fitbit/sensor.py
+++ b/homeassistant/components/fitbit/sensor.py
@@ -11,7 +11,12 @@ import voluptuous as vol
 
 from homeassistant.components.http import HomeAssistantView
 from homeassistant.components.sensor import PLATFORM_SCHEMA
-from homeassistant.const import ATTR_ATTRIBUTION, CONF_UNIT_SYSTEM
+from homeassistant.const import (
+    ATTR_ATTRIBUTION,
+    CONF_UNIT_SYSTEM,
+    TIME_MILLISECONDS,
+    TIME_MINUTES,
+)
 from homeassistant.core import callback
 import homeassistant.helpers.config_validation as cv
 from homeassistant.helpers.entity import Entity
@@ -48,14 +53,14 @@ FITBIT_RESOURCES_LIST = {
     "activities/elevation": ["Elevation", "", "walk"],
     "activities/floors": ["Floors", "floors", "walk"],
     "activities/heart": ["Resting Heart Rate", "bpm", "heart-pulse"],
-    "activities/minutesFairlyActive": ["Minutes Fairly Active", "minutes", "walk"],
-    "activities/minutesLightlyActive": ["Minutes Lightly Active", "minutes", "walk"],
+    "activities/minutesFairlyActive": ["Minutes Fairly Active", TIME_MINUTES, "walk"],
+    "activities/minutesLightlyActive": ["Minutes Lightly Active", TIME_MINUTES, "walk"],
     "activities/minutesSedentary": [
         "Minutes Sedentary",
-        "minutes",
+        TIME_MINUTES,
         "seat-recline-normal",
     ],
-    "activities/minutesVeryActive": ["Minutes Very Active", "minutes", "run"],
+    "activities/minutesVeryActive": ["Minutes Very Active", TIME_MINUTES, "run"],
     "activities/steps": ["Steps", "steps", "walk"],
     "activities/tracker/activityCalories": ["Tracker Activity Calories", "cal", "fire"],
     "activities/tracker/calories": ["Tracker Calories", "cal", "fire"],
@@ -64,22 +69,22 @@ FITBIT_RESOURCES_LIST = {
     "activities/tracker/floors": ["Tracker Floors", "floors", "walk"],
     "activities/tracker/minutesFairlyActive": [
         "Tracker Minutes Fairly Active",
-        "minutes",
+        TIME_MINUTES,
         "walk",
     ],
     "activities/tracker/minutesLightlyActive": [
         "Tracker Minutes Lightly Active",
-        "minutes",
+        TIME_MINUTES,
         "walk",
     ],
     "activities/tracker/minutesSedentary": [
         "Tracker Minutes Sedentary",
-        "minutes",
+        TIME_MINUTES,
         "seat-recline-normal",
     ],
     "activities/tracker/minutesVeryActive": [
         "Tracker Minutes Very Active",
-        "minutes",
+        TIME_MINUTES,
         "run",
     ],
     "activities/tracker/steps": ["Tracker Steps", "steps", "walk"],
@@ -89,17 +94,21 @@ FITBIT_RESOURCES_LIST = {
     "devices/battery": ["Battery", None, None],
     "sleep/awakeningsCount": ["Awakenings Count", "times awaken", "sleep"],
     "sleep/efficiency": ["Sleep Efficiency", "%", "sleep"],
-    "sleep/minutesAfterWakeup": ["Minutes After Wakeup", "minutes", "sleep"],
-    "sleep/minutesAsleep": ["Sleep Minutes Asleep", "minutes", "sleep"],
-    "sleep/minutesAwake": ["Sleep Minutes Awake", "minutes", "sleep"],
-    "sleep/minutesToFallAsleep": ["Sleep Minutes to Fall Asleep", "minutes", "sleep"],
+    "sleep/minutesAfterWakeup": ["Minutes After Wakeup", TIME_MINUTES, "sleep"],
+    "sleep/minutesAsleep": ["Sleep Minutes Asleep", TIME_MINUTES, "sleep"],
+    "sleep/minutesAwake": ["Sleep Minutes Awake", TIME_MINUTES, "sleep"],
+    "sleep/minutesToFallAsleep": [
+        "Sleep Minutes to Fall Asleep",
+        TIME_MINUTES,
+        "sleep",
+    ],
     "sleep/startTime": ["Sleep Start Time", None, "clock"],
-    "sleep/timeInBed": ["Sleep Time in Bed", "minutes", "hotel"],
+    "sleep/timeInBed": ["Sleep Time in Bed", TIME_MINUTES, "hotel"],
 }
 
 FITBIT_MEASUREMENTS = {
     "en_US": {
-        "duration": "ms",
+        "duration": TIME_MILLISECONDS,
         "distance": "mi",
         "elevation": "ft",
         "height": "in",
@@ -110,7 +119,7 @@ FITBIT_MEASUREMENTS = {
         "battery": "",
     },
     "en_GB": {
-        "duration": "milliseconds",
+        "duration": TIME_MILLISECONDS,
         "distance": "kilometers",
         "elevation": "meters",
         "height": "centimeters",
@@ -121,7 +130,7 @@ FITBIT_MEASUREMENTS = {
         "battery": "",
     },
     "metric": {
-        "duration": "milliseconds",
+        "duration": TIME_MILLISECONDS,
         "distance": "kilometers",
         "elevation": "meters",
         "height": "centimeters",
diff --git a/homeassistant/components/foobot/sensor.py b/homeassistant/components/foobot/sensor.py
index efb74e2cc9a..656631f0774 100644
--- a/homeassistant/components/foobot/sensor.py
+++ b/homeassistant/components/foobot/sensor.py
@@ -13,6 +13,7 @@ from homeassistant.const import (
     CONF_TOKEN,
     CONF_USERNAME,
     TEMP_CELSIUS,
+    TIME_SECONDS,
 )
 from homeassistant.exceptions import PlatformNotReady
 from homeassistant.helpers.aiohttp_client import async_get_clientsession
@@ -30,7 +31,7 @@ ATTR_VOLATILE_ORGANIC_COMPOUNDS = "VOC"
 ATTR_FOOBOT_INDEX = "index"
 
 SENSOR_TYPES = {
-    "time": [ATTR_TIME, "s"],
+    "time": [ATTR_TIME, TIME_SECONDS],
     "pm": [ATTR_PM2_5, "µg/m3", "mdi:cloud"],
     "tmp": [ATTR_TEMPERATURE, TEMP_CELSIUS, "mdi:thermometer"],
     "hum": [ATTR_HUMIDITY, "%", "mdi:water-percent"],
diff --git a/homeassistant/components/garmin_connect/const.py b/homeassistant/components/garmin_connect/const.py
index b5faeab77b4..c01f11464a1 100644
--- a/homeassistant/components/garmin_connect/const.py
+++ b/homeassistant/components/garmin_connect/const.py
@@ -1,5 +1,5 @@
 """Constants for the Garmin Connect integration."""
-from homeassistant.const import DEVICE_CLASS_TIMESTAMP
+from homeassistant.const import DEVICE_CLASS_TIMESTAMP, TIME_MINUTES
 
 DOMAIN = "garmin_connect"
 ATTRIBUTION = "Data provided by garmin.com"
@@ -52,20 +52,32 @@ GARMIN_ENTITY_LIST = {
         False,
     ],
     "wellnessKilocalories": ["Wellness KiloCalories", "kcal", "mdi:food", None, False],
-    "highlyActiveSeconds": ["Highly Active Time", "min", "mdi:fire", None, False],
-    "activeSeconds": ["Active Time", "min", "mdi:fire", None, True],
-    "sedentarySeconds": ["Sedentary Time", "min", "mdi:seat", None, True],
-    "sleepingSeconds": ["Sleeping Time", "min", "mdi:sleep", None, True],
-    "measurableAwakeDuration": ["Awake Duration", "min", "mdi:sleep", None, True],
-    "measurableAsleepDuration": ["Sleep Duration", "min", "mdi:sleep", None, True],
-    "floorsAscendedInMeters": ["Floors Ascended Mtr", "m", "mdi:stairs", None, False],
-    "floorsDescendedInMeters": [
-        "Floors Descended Mtr",
-        "m",
-        "mdi:stairs",
+    "highlyActiveSeconds": [
+        "Highly Active Time",
+        TIME_MINUTES,
+        "mdi:fire",
         None,
         False,
     ],
+    "activeSeconds": ["Active Time", TIME_MINUTES, "mdi:fire", None, True],
+    "sedentarySeconds": ["Sedentary Time", TIME_MINUTES, "mdi:seat", None, True],
+    "sleepingSeconds": ["Sleeping Time", TIME_MINUTES, "mdi:sleep", None, True],
+    "measurableAwakeDuration": [
+        "Awake Duration",
+        TIME_MINUTES,
+        "mdi:sleep",
+        None,
+        True,
+    ],
+    "measurableAsleepDuration": [
+        "Sleep Duration",
+        TIME_MINUTES,
+        "mdi:sleep",
+        None,
+        True,
+    ],
+    "floorsAscendedInMeters": ["Floors Ascended Mtr", "m", "mdi:stairs", None, False],
+    "floorsDescendedInMeters": ["Floors Descended Mtr", "m", "mdi:stairs", None, False],
     "floorsAscended": ["Floors Ascended", "floors", "mdi:stairs", None, True],
     "floorsDescended": ["Floors Descended", "floors", "mdi:stairs", None, True],
     "userFloorsAscendedGoal": [
@@ -97,46 +109,52 @@ GARMIN_ENTITY_LIST = {
     "averageStressLevel": ["Avg Stress Level", "", "mdi:flash-alert", None, True],
     "maxStressLevel": ["Max Stress Level", "", "mdi:flash-alert", None, True],
     "stressQualifier": ["Stress Qualifier", "", "mdi:flash-alert", None, False],
-    "stressDuration": ["Stress Duration", "min", "mdi:flash-alert", None, False],
+    "stressDuration": ["Stress Duration", TIME_MINUTES, "mdi:flash-alert", None, False],
     "restStressDuration": [
         "Rest Stress Duration",
-        "min",
+        TIME_MINUTES,
         "mdi:flash-alert",
         None,
         True,
     ],
     "activityStressDuration": [
         "Activity Stress Duration",
-        "min",
+        TIME_MINUTES,
         "mdi:flash-alert",
         None,
         True,
     ],
     "uncategorizedStressDuration": [
         "Uncat. Stress Duration",
-        "min",
+        TIME_MINUTES,
         "mdi:flash-alert",
         None,
         True,
     ],
     "totalStressDuration": [
         "Total Stress Duration",
-        "min",
+        TIME_MINUTES,
+        "mdi:flash-alert",
+        None,
+        True,
+    ],
+    "lowStressDuration": [
+        "Low Stress Duration",
+        TIME_MINUTES,
         "mdi:flash-alert",
         None,
         True,
     ],
-    "lowStressDuration": ["Low Stress Duration", "min", "mdi:flash-alert", None, True],
     "mediumStressDuration": [
         "Medium Stress Duration",
-        "min",
+        TIME_MINUTES,
         "mdi:flash-alert",
         None,
         True,
     ],
     "highStressDuration": [
         "High Stress Duration",
-        "min",
+        TIME_MINUTES,
         "mdi:flash-alert",
         None,
         True,
@@ -186,19 +204,25 @@ GARMIN_ENTITY_LIST = {
     ],
     "moderateIntensityMinutes": [
         "Moderate Intensity",
-        "min",
+        TIME_MINUTES,
         "mdi:flash-alert",
         None,
         False,
     ],
     "vigorousIntensityMinutes": [
         "Vigorous Intensity",
-        "min",
+        TIME_MINUTES,
+        "mdi:run-fast",
+        None,
+        False,
+    ],
+    "intensityMinutesGoal": [
+        "Intensity Goal",
+        TIME_MINUTES,
         "mdi:run-fast",
         None,
         False,
     ],
-    "intensityMinutesGoal": ["Intensity Goal", "min", "mdi:run-fast", None, False],
     "bodyBatteryChargedValue": [
         "Body Battery Charged",
         "%",
diff --git a/homeassistant/components/google_travel_time/sensor.py b/homeassistant/components/google_travel_time/sensor.py
index 3ee72928fc1..7f106bc7e3e 100644
--- a/homeassistant/components/google_travel_time/sensor.py
+++ b/homeassistant/components/google_travel_time/sensor.py
@@ -14,6 +14,7 @@ from homeassistant.const import (
     CONF_MODE,
     CONF_NAME,
     EVENT_HOMEASSISTANT_START,
+    TIME_MINUTES,
 )
 from homeassistant.helpers import location
 import homeassistant.helpers.config_validation as cv
@@ -188,7 +189,7 @@ class GoogleTravelTimeSensor(Entity):
         self._hass = hass
         self._name = name
         self._options = options
-        self._unit_of_measurement = "min"
+        self._unit_of_measurement = TIME_MINUTES
         self._matrix = None
         self.valid_api_connection = True
 
diff --git a/homeassistant/components/google_wifi/sensor.py b/homeassistant/components/google_wifi/sensor.py
index 9d6f3ea3d58..9dfa26fab75 100644
--- a/homeassistant/components/google_wifi/sensor.py
+++ b/homeassistant/components/google_wifi/sensor.py
@@ -11,6 +11,7 @@ from homeassistant.const import (
     CONF_MONITORED_CONDITIONS,
     CONF_NAME,
     STATE_UNKNOWN,
+    TIME_DAYS,
 )
 import homeassistant.helpers.config_validation as cv
 from homeassistant.helpers.entity import Entity
@@ -39,7 +40,7 @@ MONITORED_CONDITIONS = {
         "mdi:checkbox-marked-circle-outline",
     ],
     ATTR_NEW_VERSION: [["software", "updateNewVersion"], None, "mdi:update"],
-    ATTR_UPTIME: [["system", "uptime"], "days", "mdi:timelapse"],
+    ATTR_UPTIME: [["system", "uptime"], TIME_DAYS, "mdi:timelapse"],
     ATTR_LAST_RESTART: [["system", "uptime"], None, "mdi:restart"],
     ATTR_LOCAL_IP: [["wan", "localIpAddress"], None, "mdi:access-point-network"],
     ATTR_STATUS: [["wan", "online"], None, "mdi:google"],
diff --git a/homeassistant/components/greeneye_monitor/__init__.py b/homeassistant/components/greeneye_monitor/__init__.py
index dcd383a7463..697a96649ab 100644
--- a/homeassistant/components/greeneye_monitor/__init__.py
+++ b/homeassistant/components/greeneye_monitor/__init__.py
@@ -9,6 +9,9 @@ from homeassistant.const import (
     CONF_PORT,
     CONF_TEMPERATURE_UNIT,
     EVENT_HOMEASSISTANT_STOP,
+    TIME_HOURS,
+    TIME_MINUTES,
+    TIME_SECONDS,
 )
 import homeassistant.helpers.config_validation as cv
 from homeassistant.helpers.discovery import async_load_platform
@@ -40,10 +43,6 @@ SENSOR_TYPE_VOLTAGE = "voltage_sensor"
 
 TEMPERATURE_UNIT_CELSIUS = "C"
 
-TIME_UNIT_SECOND = "s"
-TIME_UNIT_MINUTE = "min"
-TIME_UNIT_HOUR = "h"
-
 TEMPERATURE_SENSOR_SCHEMA = vol.Schema(
     {vol.Required(CONF_NUMBER): vol.Range(1, 8), vol.Required(CONF_NAME): cv.string}
 )
@@ -69,8 +68,8 @@ PULSE_COUNTER_SCHEMA = vol.Schema(
         vol.Required(CONF_NAME): cv.string,
         vol.Required(CONF_COUNTED_QUANTITY): cv.string,
         vol.Optional(CONF_COUNTED_QUANTITY_PER_PULSE, default=1.0): vol.Coerce(float),
-        vol.Optional(CONF_TIME_UNIT, default=TIME_UNIT_SECOND): vol.Any(
-            TIME_UNIT_SECOND, TIME_UNIT_MINUTE, TIME_UNIT_HOUR
+        vol.Optional(CONF_TIME_UNIT, default=TIME_SECONDS): vol.Any(
+            TIME_SECONDS, TIME_MINUTES, TIME_HOURS
         ),
     }
 )
diff --git a/homeassistant/components/greeneye_monitor/sensor.py b/homeassistant/components/greeneye_monitor/sensor.py
index 2640c701f92..b88b2567750 100644
--- a/homeassistant/components/greeneye_monitor/sensor.py
+++ b/homeassistant/components/greeneye_monitor/sensor.py
@@ -1,7 +1,14 @@
 """Support for the sensors in a GreenEye Monitor."""
 import logging
 
-from homeassistant.const import CONF_NAME, CONF_TEMPERATURE_UNIT, POWER_WATT
+from homeassistant.const import (
+    CONF_NAME,
+    CONF_TEMPERATURE_UNIT,
+    POWER_WATT,
+    TIME_HOURS,
+    TIME_MINUTES,
+    TIME_SECONDS,
+)
 from homeassistant.helpers.entity import Entity
 
 from . import (
@@ -17,9 +24,6 @@ from . import (
     SENSOR_TYPE_PULSE_COUNTER,
     SENSOR_TYPE_TEMPERATURE,
     SENSOR_TYPE_VOLTAGE,
-    TIME_UNIT_HOUR,
-    TIME_UNIT_MINUTE,
-    TIME_UNIT_SECOND,
 )
 
 _LOGGER = logging.getLogger(__name__)
@@ -235,11 +239,11 @@ class PulseCounter(GEMSensor):
     @property
     def _seconds_per_time_unit(self):
         """Return the number of seconds in the given display time unit."""
-        if self._time_unit == TIME_UNIT_SECOND:
+        if self._time_unit == TIME_SECONDS:
             return 1
-        if self._time_unit == TIME_UNIT_MINUTE:
+        if self._time_unit == TIME_MINUTES:
             return 60
-        if self._time_unit == TIME_UNIT_HOUR:
+        if self._time_unit == TIME_HOURS:
             return 3600
 
     @property
diff --git a/homeassistant/components/here_travel_time/sensor.py b/homeassistant/components/here_travel_time/sensor.py
index 316e73dc096..8113548b5ca 100644
--- a/homeassistant/components/here_travel_time/sensor.py
+++ b/homeassistant/components/here_travel_time/sensor.py
@@ -18,6 +18,7 @@ from homeassistant.const import (
     CONF_UNIT_SYSTEM_IMPERIAL,
     CONF_UNIT_SYSTEM_METRIC,
     EVENT_HOMEASSISTANT_START,
+    TIME_MINUTES,
 )
 from homeassistant.core import HomeAssistant, State, callback
 from homeassistant.helpers import location
@@ -85,8 +86,6 @@ ATTR_DURATION_IN_TRAFFIC = "duration_in_traffic"
 ATTR_ORIGIN_NAME = "origin_name"
 ATTR_DESTINATION_NAME = "destination_name"
 
-UNIT_OF_MEASUREMENT = "min"
-
 SCAN_INTERVAL = timedelta(minutes=5)
 
 NO_ROUTE_ERROR_MESSAGE = "HERE could not find a route based on the input"
@@ -209,7 +208,7 @@ class HERETravelTimeSensor(Entity):
         self._origin_entity_id = origin_entity_id
         self._destination_entity_id = destination_entity_id
         self._here_data = here_data
-        self._unit_of_measurement = UNIT_OF_MEASUREMENT
+        self._unit_of_measurement = TIME_MINUTES
         self._attrs = {
             ATTR_UNIT_SYSTEM: self._here_data.units,
             ATTR_MODE: self._here_data.travel_mode,
diff --git a/homeassistant/components/history_stats/sensor.py b/homeassistant/components/history_stats/sensor.py
index 3eb604b3957..0b1289ab05f 100644
--- a/homeassistant/components/history_stats/sensor.py
+++ b/homeassistant/components/history_stats/sensor.py
@@ -13,6 +13,7 @@ from homeassistant.const import (
     CONF_STATE,
     CONF_TYPE,
     EVENT_HOMEASSISTANT_START,
+    TIME_HOURS,
 )
 from homeassistant.core import callback
 from homeassistant.exceptions import TemplateError
@@ -35,7 +36,7 @@ CONF_TYPE_COUNT = "count"
 CONF_TYPE_KEYS = [CONF_TYPE_TIME, CONF_TYPE_RATIO, CONF_TYPE_COUNT]
 
 DEFAULT_NAME = "unnamed statistics"
-UNITS = {CONF_TYPE_TIME: "h", CONF_TYPE_RATIO: "%", CONF_TYPE_COUNT: ""}
+UNITS = {CONF_TYPE_TIME: TIME_HOURS, CONF_TYPE_RATIO: "%", CONF_TYPE_COUNT: ""}
 ICON = "mdi:chart-line"
 
 ATTR_VALUE = "value"
diff --git a/homeassistant/components/homematic/sensor.py b/homeassistant/components/homematic/sensor.py
index bba8325650d..e7ab5ddfefc 100644
--- a/homeassistant/components/homematic/sensor.py
+++ b/homeassistant/components/homematic/sensor.py
@@ -8,6 +8,7 @@ from homeassistant.const import (
     DEVICE_CLASS_TEMPERATURE,
     ENERGY_WATT_HOUR,
     POWER_WATT,
+    TIME_HOURS,
 )
 
 from .const import ATTR_DISCOVER_DEVICES
@@ -47,7 +48,7 @@ HM_UNIT_HA_CAST = {
     "LOWEST_ILLUMINATION": "lx",
     "HIGHEST_ILLUMINATION": "lx",
     "RAIN_COUNTER": "mm",
-    "WIND_SPEED": "km/h",
+    "WIND_SPEED": f"km/{TIME_HOURS}",
     "WIND_DIRECTION": "°",
     "WIND_DIRECTION_RANGE": "°",
     "SUNSHINEDURATION": "#",
diff --git a/homeassistant/components/homematicip_cloud/sensor.py b/homeassistant/components/homematicip_cloud/sensor.py
index d6a226a83dc..f38eea840c6 100644
--- a/homeassistant/components/homematicip_cloud/sensor.py
+++ b/homeassistant/components/homematicip_cloud/sensor.py
@@ -32,6 +32,7 @@ from homeassistant.const import (
     DEVICE_CLASS_TEMPERATURE,
     POWER_WATT,
     TEMP_CELSIUS,
+    TIME_HOURS,
 )
 from homeassistant.helpers.typing import HomeAssistantType
 
@@ -332,7 +333,7 @@ class HomematicipWindspeedSensor(HomematicipGenericDevice):
     @property
     def unit_of_measurement(self) -> str:
         """Return the unit this state is expressed in."""
-        return "km/h"
+        return f"km/{TIME_HOURS}"
 
     @property
     def device_state_attributes(self) -> Dict[str, Any]:
diff --git a/homeassistant/components/huawei_lte/const.py b/homeassistant/components/huawei_lte/const.py
index 6d699420283..41814d5ae10 100644
--- a/homeassistant/components/huawei_lte/const.py
+++ b/homeassistant/components/huawei_lte/const.py
@@ -8,8 +8,6 @@ DEFAULT_NOTIFY_SERVICE_NAME = DOMAIN
 UPDATE_SIGNAL = f"{DOMAIN}_update"
 UPDATE_OPTIONS_SIGNAL = f"{DOMAIN}_options_update"
 
-UNIT_SECONDS = "s"
-
 CONNECTION_TIMEOUT = 10
 NOTIFY_SUPPRESS_TIMEOUT = 30
 
diff --git a/homeassistant/components/huawei_lte/sensor.py b/homeassistant/components/huawei_lte/sensor.py
index 54c5441c6e2..8ca5e02dcdd 100644
--- a/homeassistant/components/huawei_lte/sensor.py
+++ b/homeassistant/components/huawei_lte/sensor.py
@@ -10,7 +10,7 @@ from homeassistant.components.sensor import (
     DEVICE_CLASS_SIGNAL_STRENGTH,
     DOMAIN as SENSOR_DOMAIN,
 )
-from homeassistant.const import CONF_URL, DATA_BYTES, STATE_UNKNOWN
+from homeassistant.const import CONF_URL, DATA_BYTES, STATE_UNKNOWN, TIME_SECONDS
 
 from . import HuaweiLteBaseEntity
 from .const import (
@@ -18,7 +18,6 @@ from .const import (
     KEY_DEVICE_INFORMATION,
     KEY_DEVICE_SIGNAL,
     KEY_MONITORING_TRAFFIC_STATISTICS,
-    UNIT_SECONDS,
 )
 
 _LOGGER = logging.getLogger(__name__)
@@ -122,7 +121,7 @@ SENSOR_META = {
         exclude=re.compile(r"^showtraffic$", re.IGNORECASE)
     ),
     (KEY_MONITORING_TRAFFIC_STATISTICS, "CurrentConnectTime"): dict(
-        name="Current connection duration", unit=UNIT_SECONDS, icon="mdi:timer"
+        name="Current connection duration", unit=TIME_SECONDS, icon="mdi:timer"
     ),
     (KEY_MONITORING_TRAFFIC_STATISTICS, "CurrentDownload"): dict(
         name="Current connection download", unit=DATA_BYTES, icon="mdi:download"
@@ -131,7 +130,7 @@ SENSOR_META = {
         name="Current connection upload", unit=DATA_BYTES, icon="mdi:upload"
     ),
     (KEY_MONITORING_TRAFFIC_STATISTICS, "TotalConnectTime"): dict(
-        name="Total connected duration", unit=UNIT_SECONDS, icon="mdi:timer"
+        name="Total connected duration", unit=TIME_SECONDS, icon="mdi:timer"
     ),
     (KEY_MONITORING_TRAFFIC_STATISTICS, "TotalDownload"): dict(
         name="Total download", unit=DATA_BYTES, icon="mdi:download"
diff --git a/homeassistant/components/hydrawise/__init__.py b/homeassistant/components/hydrawise/__init__.py
index 57ed29d9780..b8ed596d286 100644
--- a/homeassistant/components/hydrawise/__init__.py
+++ b/homeassistant/components/hydrawise/__init__.py
@@ -6,7 +6,12 @@ from hydrawiser.core import Hydrawiser
 from requests.exceptions import ConnectTimeout, HTTPError
 import voluptuous as vol
 
-from homeassistant.const import ATTR_ATTRIBUTION, CONF_ACCESS_TOKEN, CONF_SCAN_INTERVAL
+from homeassistant.const import (
+    ATTR_ATTRIBUTION,
+    CONF_ACCESS_TOKEN,
+    CONF_SCAN_INTERVAL,
+    TIME_MINUTES,
+)
 from homeassistant.core import callback
 import homeassistant.helpers.config_validation as cv
 from homeassistant.helpers.dispatcher import async_dispatcher_connect, dispatcher_send
@@ -40,7 +45,7 @@ DEVICE_MAP = {
     "manual_watering": ["Manual Watering", "mdi:water-pump", "", ""],
     "next_cycle": ["Next Cycle", "mdi:calendar-clock", "", ""],
     "status": ["Status", "", "connectivity", ""],
-    "watering_time": ["Watering Time", "mdi:water-pump", "", "min"],
+    "watering_time": ["Watering Time", "mdi:water-pump", "", TIME_MINUTES],
     "rain_sensor": ["Rain Sensor", "", "moisture", ""],
 }
 
diff --git a/homeassistant/components/integration/sensor.py b/homeassistant/components/integration/sensor.py
index 560a7cbd33c..dea7a5083dc 100644
--- a/homeassistant/components/integration/sensor.py
+++ b/homeassistant/components/integration/sensor.py
@@ -10,6 +10,10 @@ from homeassistant.const import (
     CONF_NAME,
     STATE_UNAVAILABLE,
     STATE_UNKNOWN,
+    TIME_DAYS,
+    TIME_HOURS,
+    TIME_MINUTES,
+    TIME_SECONDS,
 )
 from homeassistant.core import callback
 import homeassistant.helpers.config_validation as cv
@@ -38,7 +42,12 @@ INTEGRATION_METHOD = [TRAPEZOIDAL_METHOD, LEFT_METHOD, RIGHT_METHOD]
 UNIT_PREFIXES = {None: 1, "k": 10 ** 3, "G": 10 ** 6, "T": 10 ** 9}
 
 # SI Time prefixes
-UNIT_TIME = {"s": 1, "min": 60, "h": 60 * 60, "d": 24 * 60 * 60}
+UNIT_TIME = {
+    TIME_SECONDS: 1,
+    TIME_MINUTES: 60,
+    TIME_HOURS: 60 * 60,
+    TIME_DAYS: 24 * 60 * 60,
+}
 
 ICON = "mdi:chart-histogram"
 
@@ -50,7 +59,7 @@ PLATFORM_SCHEMA = PLATFORM_SCHEMA.extend(
         vol.Required(CONF_SOURCE_SENSOR): cv.entity_id,
         vol.Optional(CONF_ROUND_DIGITS, default=DEFAULT_ROUND): vol.Coerce(int),
         vol.Optional(CONF_UNIT_PREFIX, default=None): vol.In(UNIT_PREFIXES),
-        vol.Optional(CONF_UNIT_TIME, default="h"): vol.In(UNIT_TIME),
+        vol.Optional(CONF_UNIT_TIME, default=TIME_HOURS): vol.In(UNIT_TIME),
         vol.Optional(CONF_UNIT_OF_MEASUREMENT): cv.string,
         vol.Optional(CONF_METHOD, default=TRAPEZOIDAL_METHOD): vol.In(
             INTEGRATION_METHOD
diff --git a/homeassistant/components/irish_rail_transport/sensor.py b/homeassistant/components/irish_rail_transport/sensor.py
index 883f4ed7b39..3bb7da52e22 100644
--- a/homeassistant/components/irish_rail_transport/sensor.py
+++ b/homeassistant/components/irish_rail_transport/sensor.py
@@ -6,7 +6,7 @@ from pyirishrail.pyirishrail import IrishRailRTPI
 import voluptuous as vol
 
 from homeassistant.components.sensor import PLATFORM_SCHEMA
-from homeassistant.const import ATTR_ATTRIBUTION, CONF_NAME
+from homeassistant.const import ATTR_ATTRIBUTION, CONF_NAME, TIME_MINUTES
 import homeassistant.helpers.config_validation as cv
 from homeassistant.helpers.entity import Entity
 
@@ -118,7 +118,7 @@ class IrishRailTransportSensor(Entity):
     @property
     def unit_of_measurement(self):
         """Return the unit this state is expressed in."""
-        return "min"
+        return TIME_MINUTES
 
     @property
     def icon(self):
diff --git a/homeassistant/components/isy994/sensor.py b/homeassistant/components/isy994/sensor.py
index a9746b004d0..563f292c489 100644
--- a/homeassistant/components/isy994/sensor.py
+++ b/homeassistant/components/isy994/sensor.py
@@ -3,7 +3,19 @@ import logging
 from typing import Callable
 
 from homeassistant.components.sensor import DOMAIN
-from homeassistant.const import POWER_WATT, TEMP_CELSIUS, TEMP_FAHRENHEIT, UNIT_UV_INDEX
+from homeassistant.const import (
+    POWER_WATT,
+    TEMP_CELSIUS,
+    TEMP_FAHRENHEIT,
+    TIME_DAYS,
+    TIME_HOURS,
+    TIME_MILLISECONDS,
+    TIME_MINUTES,
+    TIME_MONTHS,
+    TIME_SECONDS,
+    TIME_YEARS,
+    UNIT_UV_INDEX,
+)
 from homeassistant.helpers.typing import ConfigType
 
 from . import ISY994_NODES, ISY994_WEATHER, ISYDevice
@@ -12,22 +24,22 @@ _LOGGER = logging.getLogger(__name__)
 
 UOM_FRIENDLY_NAME = {
     "1": "amp",
-    "3": "btu/h",
+    "3": f"btu/{TIME_HOURS}",
     "4": TEMP_CELSIUS,
     "5": "cm",
     "6": "ft³",
-    "7": "ft³/min",
+    "7": f"ft³/{TIME_MINUTES}",
     "8": "m³",
-    "9": "day",
-    "10": "days",
+    "9": TIME_DAYS,
+    "10": TIME_DAYS,
     "12": "dB",
     "13": "dB A",
     "14": "°",
     "16": "macroseismic",
     "17": TEMP_FAHRENHEIT,
     "18": "ft",
-    "19": "hour",
-    "20": "hours",
+    "19": TIME_HOURS,
+    "20": TIME_HOURS,
     "21": "abs. humidity (%)",
     "22": "rel. humidity (%)",
     "23": "inHg",
@@ -47,24 +59,24 @@ UOM_FRIENDLY_NAME = {
     "37": "mercalli",
     "38": "m",
     "39": "m³/hr",
-    "40": "m/s",
+    "40": f"m/{TIME_SECONDS}",
     "41": "mA",
-    "42": "ms",
+    "42": TIME_MILLISECONDS,
     "43": "mV",
-    "44": "min",
-    "45": "min",
+    "44": TIME_MINUTES,
+    "45": TIME_MINUTES,
     "46": "mm/hr",
-    "47": "month",
+    "47": TIME_MONTHS,
     "48": "MPH",
-    "49": "m/s",
+    "49": f"m/{TIME_SECONDS}",
     "50": "ohm",
     "51": "%",
     "52": "lb",
     "53": "power factor",
     "54": "ppm",
     "55": "pulse count",
-    "57": "s",
-    "58": "s",
+    "57": TIME_SECONDS,
+    "58": TIME_SECONDS,
     "59": "seimens/m",
     "60": "body wave magnitude scale",
     "61": "Ricter scale",
@@ -79,7 +91,7 @@ UOM_FRIENDLY_NAME = {
     "74": "W/m²",
     "75": "weekday",
     "76": "Wind Direction (°)",
-    "77": "year",
+    "77": TIME_YEARS,
     "82": "mm",
     "83": "km",
     "85": "ohm",
diff --git a/homeassistant/components/juicenet/sensor.py b/homeassistant/components/juicenet/sensor.py
index 9a0431ef2d8..67a04d39556 100644
--- a/homeassistant/components/juicenet/sensor.py
+++ b/homeassistant/components/juicenet/sensor.py
@@ -1,7 +1,7 @@
 """Support for monitoring juicenet/juicepoint/juicebox based EVSE sensors."""
 import logging
 
-from homeassistant.const import ENERGY_WATT_HOUR, POWER_WATT, TEMP_CELSIUS
+from homeassistant.const import ENERGY_WATT_HOUR, POWER_WATT, TEMP_CELSIUS, TIME_SECONDS
 from homeassistant.helpers.entity import Entity
 
 from . import DOMAIN, JuicenetDevice
@@ -14,7 +14,7 @@ SENSOR_TYPES = {
     "voltage": ["Voltage", "V"],
     "amps": ["Amps", "A"],
     "watts": ["Watts", POWER_WATT],
-    "charge_time": ["Charge time", "s"],
+    "charge_time": ["Charge time", TIME_SECONDS],
     "energy_added": ["Energy added", ENERGY_WATT_HOUR],
 }
 
diff --git a/homeassistant/components/lcn/services.py b/homeassistant/components/lcn/services.py
index ba9d52b7721..1a5d4475b0e 100644
--- a/homeassistant/components/lcn/services.py
+++ b/homeassistant/components/lcn/services.py
@@ -7,6 +7,7 @@ from homeassistant.const import (
     CONF_BRIGHTNESS,
     CONF_STATE,
     CONF_UNIT_OF_MEASUREMENT,
+    TIME_SECONDS,
 )
 import homeassistant.helpers.config_validation as cv
 
@@ -281,7 +282,7 @@ class SendKeys(LcnServiceCall):
                 vol.Upper, vol.In(SENDKEYCOMMANDS)
             ),
             vol.Optional(CONF_TIME, default=0): vol.All(int, vol.Range(min=0)),
-            vol.Optional(CONF_TIME_UNIT, default="s"): vol.All(
+            vol.Optional(CONF_TIME_UNIT, default=TIME_SECONDS): vol.All(
                 vol.Upper, vol.In(TIME_UNITS)
             ),
         }
@@ -324,7 +325,7 @@ class LockKeys(LcnServiceCall):
             ),
             vol.Required(CONF_STATE): is_key_lock_states_string,
             vol.Optional(CONF_TIME, default=0): vol.All(int, vol.Range(min=0)),
-            vol.Optional(CONF_TIME_UNIT, default="s"): vol.All(
+            vol.Optional(CONF_TIME_UNIT, default=TIME_SECONDS): vol.All(
                 vol.Upper, vol.In(TIME_UNITS)
             ),
         }
diff --git a/homeassistant/components/lyft/sensor.py b/homeassistant/components/lyft/sensor.py
index 1b90d66398e..d76fe9f0dc5 100644
--- a/homeassistant/components/lyft/sensor.py
+++ b/homeassistant/components/lyft/sensor.py
@@ -8,6 +8,7 @@ from lyft_rides.errors import APIError
 import voluptuous as vol
 
 from homeassistant.components.sensor import PLATFORM_SCHEMA
+from homeassistant.const import TIME_MINUTES
 import homeassistant.helpers.config_validation as cv
 from homeassistant.helpers.entity import Entity
 from homeassistant.util import Throttle
@@ -88,7 +89,7 @@ class LyftSensor(Entity):
         if "lyft" not in self._name.lower():
             self._name = f"Lyft{self._name}"
         if self._sensortype == "time":
-            self._unit_of_measurement = "min"
+            self._unit_of_measurement = TIME_MINUTES
         elif self._sensortype == "price":
             estimate = self._product["estimate"]
             if estimate is not None:
diff --git a/homeassistant/components/meteo_france/const.py b/homeassistant/components/meteo_france/const.py
index fae2000b19a..d797f610dca 100644
--- a/homeassistant/components/meteo_france/const.py
+++ b/homeassistant/components/meteo_france/const.py
@@ -1,6 +1,6 @@
 """Meteo-France component constants."""
 
-from homeassistant.const import TEMP_CELSIUS
+from homeassistant.const import TEMP_CELSIUS, TIME_HOURS, TIME_MINUTES
 
 DOMAIN = "meteo_france"
 PLATFORMS = ["sensor", "weather"]
@@ -47,13 +47,13 @@ SENSOR_TYPES = {
     },
     "wind_speed": {
         SENSOR_TYPE_NAME: "Wind Speed",
-        SENSOR_TYPE_UNIT: "km/h",
+        SENSOR_TYPE_UNIT: f"km/{TIME_HOURS}",
         SENSOR_TYPE_ICON: "mdi:weather-windy",
         SENSOR_TYPE_CLASS: None,
     },
     "next_rain": {
         SENSOR_TYPE_NAME: "Next rain",
-        SENSOR_TYPE_UNIT: "min",
+        SENSOR_TYPE_UNIT: TIME_MINUTES,
         SENSOR_TYPE_ICON: "mdi:weather-rainy",
         SENSOR_TYPE_CLASS: None,
     },
diff --git a/homeassistant/components/minecraft_server/const.py b/homeassistant/components/minecraft_server/const.py
index c3ab6615481..d86faf23a81 100644
--- a/homeassistant/components/minecraft_server/const.py
+++ b/homeassistant/components/minecraft_server/const.py
@@ -30,7 +30,6 @@ SCAN_INTERVAL = 60
 
 SIGNAL_NAME_PREFIX = f"signal_{DOMAIN}"
 
-UNIT_LATENCY_TIME = "ms"
 UNIT_PLAYERS_MAX = "players"
 UNIT_PLAYERS_ONLINE = "players"
 UNIT_PROTOCOL_VERSION = None
diff --git a/homeassistant/components/minecraft_server/sensor.py b/homeassistant/components/minecraft_server/sensor.py
index 0b37a7d979b..20f9e98e530 100644
--- a/homeassistant/components/minecraft_server/sensor.py
+++ b/homeassistant/components/minecraft_server/sensor.py
@@ -4,6 +4,7 @@ import logging
 from typing import Any, Dict
 
 from homeassistant.config_entries import ConfigEntry
+from homeassistant.const import TIME_MILLISECONDS
 from homeassistant.helpers.typing import HomeAssistantType
 
 from . import MinecraftServer, MinecraftServerEntity
@@ -20,7 +21,6 @@ from .const import (
     NAME_PLAYERS_ONLINE,
     NAME_PROTOCOL_VERSION,
     NAME_VERSION,
-    UNIT_LATENCY_TIME,
     UNIT_PLAYERS_MAX,
     UNIT_PLAYERS_ONLINE,
     UNIT_PROTOCOL_VERSION,
@@ -121,7 +121,7 @@ class MinecraftServerLatencyTimeSensor(MinecraftServerSensorEntity):
             server=server,
             type_name=NAME_LATENCY_TIME,
             icon=ICON_LATENCY_TIME,
-            unit=UNIT_LATENCY_TIME,
+            unit=TIME_MILLISECONDS,
         )
 
     async def async_update(self) -> None:
diff --git a/homeassistant/components/mvglive/sensor.py b/homeassistant/components/mvglive/sensor.py
index da1db0e02aa..2ceca024a6f 100644
--- a/homeassistant/components/mvglive/sensor.py
+++ b/homeassistant/components/mvglive/sensor.py
@@ -7,7 +7,7 @@ import MVGLive
 import voluptuous as vol
 
 from homeassistant.components.sensor import PLATFORM_SCHEMA
-from homeassistant.const import ATTR_ATTRIBUTION, CONF_NAME
+from homeassistant.const import ATTR_ATTRIBUTION, CONF_NAME, TIME_MINUTES
 import homeassistant.helpers.config_validation as cv
 from homeassistant.helpers.entity import Entity
 
@@ -131,7 +131,7 @@ class MVGLiveSensor(Entity):
     @property
     def unit_of_measurement(self):
         """Return the unit this state is expressed in."""
-        return "min"
+        return TIME_MINUTES
 
     def update(self):
         """Get the latest data and update the state."""
diff --git a/homeassistant/components/netatmo/sensor.py b/homeassistant/components/netatmo/sensor.py
index 818662ee69c..b5da37f012f 100644
--- a/homeassistant/components/netatmo/sensor.py
+++ b/homeassistant/components/netatmo/sensor.py
@@ -9,6 +9,7 @@ from homeassistant.const import (
     DEVICE_CLASS_HUMIDITY,
     DEVICE_CLASS_TEMPERATURE,
     TEMP_CELSIUS,
+    TIME_HOURS,
 )
 from homeassistant.helpers.entity import Entity
 from homeassistant.util import Throttle
@@ -66,10 +67,10 @@ SENSOR_TYPES = {
     "max_temp": ["Max Temp.", TEMP_CELSIUS, "mdi:thermometer", None],
     "windangle": ["Angle", "", "mdi:compass", None],
     "windangle_value": ["Angle Value", "º", "mdi:compass", None],
-    "windstrength": ["Wind Strength", "km/h", "mdi:weather-windy", None],
+    "windstrength": ["Wind Strength", f"km/{TIME_HOURS}", "mdi:weather-windy", None],
     "gustangle": ["Gust Angle", "", "mdi:compass", None],
     "gustangle_value": ["Gust Angle Value", "º", "mdi:compass", None],
-    "guststrength": ["Gust Strength", "km/h", "mdi:weather-windy", None],
+    "guststrength": ["Gust Strength", f"km/{TIME_HOURS}", "mdi:weather-windy", None],
     "reachable": ["Reachability", "", "mdi:signal", None],
     "rf_status": ["Radio", "", "mdi:signal", None],
     "rf_status_lvl": ["Radio_lvl", "", "mdi:signal", None],
diff --git a/homeassistant/components/nmbs/sensor.py b/homeassistant/components/nmbs/sensor.py
index 4865b0a9839..dfa43c35952 100644
--- a/homeassistant/components/nmbs/sensor.py
+++ b/homeassistant/components/nmbs/sensor.py
@@ -11,6 +11,7 @@ from homeassistant.const import (
     ATTR_LONGITUDE,
     CONF_NAME,
     CONF_SHOW_ON_MAP,
+    TIME_MINUTES,
 )
 import homeassistant.helpers.config_validation as cv
 from homeassistant.helpers.entity import Entity
@@ -184,7 +185,7 @@ class NMBSSensor(Entity):
     @property
     def unit_of_measurement(self):
         """Return the unit of measurement."""
-        return "min"
+        return TIME_MINUTES
 
     @property
     def icon(self):
diff --git a/homeassistant/components/nut/sensor.py b/homeassistant/components/nut/sensor.py
index bdf0eaafc99..96db220f5ea 100644
--- a/homeassistant/components/nut/sensor.py
+++ b/homeassistant/components/nut/sensor.py
@@ -18,6 +18,7 @@ from homeassistant.const import (
     POWER_WATT,
     STATE_UNKNOWN,
     TEMP_CELSIUS,
+    TIME_SECONDS,
 )
 from homeassistant.exceptions import PlatformNotReady
 import homeassistant.helpers.config_validation as cv
@@ -53,13 +54,13 @@ SENSOR_TYPES = {
     "ups.load": ["Load", "%", "mdi:gauge"],
     "ups.load.high": ["Overload Setting", "%", "mdi:gauge"],
     "ups.id": ["System identifier", "", "mdi:information-outline"],
-    "ups.delay.start": ["Load Restart Delay", "s", "mdi:timer"],
-    "ups.delay.reboot": ["UPS Reboot Delay", "s", "mdi:timer"],
-    "ups.delay.shutdown": ["UPS Shutdown Delay", "s", "mdi:timer"],
-    "ups.timer.start": ["Load Start Timer", "s", "mdi:timer"],
-    "ups.timer.reboot": ["Load Reboot Timer", "s", "mdi:timer"],
-    "ups.timer.shutdown": ["Load Shutdown Timer", "s", "mdi:timer"],
-    "ups.test.interval": ["Self-Test Interval", "s", "mdi:timer"],
+    "ups.delay.start": ["Load Restart Delay", TIME_SECONDS, "mdi:timer"],
+    "ups.delay.reboot": ["UPS Reboot Delay", TIME_SECONDS, "mdi:timer"],
+    "ups.delay.shutdown": ["UPS Shutdown Delay", TIME_SECONDS, "mdi:timer"],
+    "ups.timer.start": ["Load Start Timer", TIME_SECONDS, "mdi:timer"],
+    "ups.timer.reboot": ["Load Reboot Timer", TIME_SECONDS, "mdi:timer"],
+    "ups.timer.shutdown": ["Load Shutdown Timer", TIME_SECONDS, "mdi:timer"],
+    "ups.test.interval": ["Self-Test Interval", TIME_SECONDS, "mdi:timer"],
     "ups.test.result": ["Self-Test Result", "", "mdi:information-outline"],
     "ups.test.date": ["Self-Test Date", "", "mdi:calendar"],
     "ups.display.language": ["Language", "", "mdi:information-outline"],
@@ -89,9 +90,13 @@ SENSOR_TYPES = {
     "battery.current": ["Battery Current", "A", "mdi:flash"],
     "battery.current.total": ["Total Battery Current", "A", "mdi:flash"],
     "battery.temperature": ["Battery Temperature", TEMP_CELSIUS, "mdi:thermometer"],
-    "battery.runtime": ["Battery Runtime", "s", "mdi:timer"],
-    "battery.runtime.low": ["Low Battery Runtime", "s", "mdi:timer"],
-    "battery.runtime.restart": ["Minimum Battery Runtime to Start", "s", "mdi:timer"],
+    "battery.runtime": ["Battery Runtime", TIME_SECONDS, "mdi:timer"],
+    "battery.runtime.low": ["Low Battery Runtime", TIME_SECONDS, "mdi:timer"],
+    "battery.runtime.restart": [
+        "Minimum Battery Runtime to Start",
+        TIME_SECONDS,
+        "mdi:timer",
+    ],
     "battery.alarm.threshold": [
         "Battery Alarm Threshold",
         "",
@@ -189,8 +194,7 @@ def setup_platform(hass, config, add_entities, discovery_info=None):
         data.update(no_throttle=True)
     except data.pynuterror as err:
         _LOGGER.error(
-            "Failure while testing NUT status retrieval. Cannot continue setup: %s",
-            err,
+            "Failure while testing NUT status retrieval. Cannot continue setup: %s", err
         )
         raise PlatformNotReady
 
diff --git a/homeassistant/components/nzbget/sensor.py b/homeassistant/components/nzbget/sensor.py
index 24ef18ab985..89d2c1c01da 100644
--- a/homeassistant/components/nzbget/sensor.py
+++ b/homeassistant/components/nzbget/sensor.py
@@ -1,7 +1,11 @@
 """Monitor the NZBGet API."""
 import logging
 
-from homeassistant.const import DATA_MEGABYTES, DATA_RATE_MEGABYTES_PER_SECOND
+from homeassistant.const import (
+    DATA_MEGABYTES,
+    DATA_RATE_MEGABYTES_PER_SECOND,
+    TIME_MINUTES,
+)
 from homeassistant.core import callback
 from homeassistant.helpers.dispatcher import async_dispatcher_connect
 from homeassistant.helpers.entity import Entity
@@ -26,7 +30,7 @@ SENSOR_TYPES = {
     "post_job_count": ["PostJobCount", "Post Processing Jobs", "Jobs"],
     "post_paused": ["PostPaused", "Post Processing Paused", None],
     "remaining_size": ["RemainingSizeMB", "Queue Size", DATA_MEGABYTES],
-    "uptime": ["UpTimeSec", "Uptime", "min"],
+    "uptime": ["UpTimeSec", "Uptime", TIME_MINUTES],
 }
 
 
diff --git a/homeassistant/components/octoprint/__init__.py b/homeassistant/components/octoprint/__init__.py
index f73e525efe3..06a8ae44f1f 100644
--- a/homeassistant/components/octoprint/__init__.py
+++ b/homeassistant/components/octoprint/__init__.py
@@ -19,6 +19,7 @@ from homeassistant.const import (
     CONF_SSL,
     CONTENT_TYPE_JSON,
     TEMP_CELSIUS,
+    TIME_SECONDS,
 )
 from homeassistant.helpers import discovery
 import homeassistant.helpers.config_validation as cv
@@ -71,8 +72,14 @@ SENSOR_TYPES = {
     "Temperatures": ["printer", "temperature", "*", TEMP_CELSIUS],
     "Current State": ["printer", "state", "text", None, "mdi:printer-3d"],
     "Job Percentage": ["job", "progress", "completion", "%", "mdi:file-percent"],
-    "Time Remaining": ["job", "progress", "printTimeLeft", "seconds", "mdi:clock-end"],
-    "Time Elapsed": ["job", "progress", "printTime", "seconds", "mdi:clock-start"],
+    "Time Remaining": [
+        "job",
+        "progress",
+        "printTimeLeft",
+        TIME_SECONDS,
+        "mdi:clock-end",
+    ],
+    "Time Elapsed": ["job", "progress", "printTime", TIME_SECONDS, "mdi:clock-start"],
 }
 
 SENSOR_SCHEMA = vol.Schema(
diff --git a/homeassistant/components/openevse/sensor.py b/homeassistant/components/openevse/sensor.py
index 0ac655cd448..e0f21f6946d 100644
--- a/homeassistant/components/openevse/sensor.py
+++ b/homeassistant/components/openevse/sensor.py
@@ -11,6 +11,7 @@ from homeassistant.const import (
     CONF_MONITORED_VARIABLES,
     ENERGY_KILO_WATT_HOUR,
     TEMP_CELSIUS,
+    TIME_MINUTES,
 )
 import homeassistant.helpers.config_validation as cv
 from homeassistant.helpers.entity import Entity
@@ -19,7 +20,7 @@ _LOGGER = logging.getLogger(__name__)
 
 SENSOR_TYPES = {
     "status": ["Charging Status", None],
-    "charge_time": ["Charge Time Elapsed", "minutes"],
+    "charge_time": ["Charge Time Elapsed", TIME_MINUTES],
     "ambient_temp": ["Ambient Temperature", TEMP_CELSIUS],
     "ir_temp": ["IR Temperature", TEMP_CELSIUS],
     "rtc_temp": ["RTC Temperature", TEMP_CELSIUS],
diff --git a/homeassistant/components/opentherm_gw/const.py b/homeassistant/components/opentherm_gw/const.py
index bd9b372de33..580f9f7b1a4 100644
--- a/homeassistant/components/opentherm_gw/const.py
+++ b/homeassistant/components/opentherm_gw/const.py
@@ -1,7 +1,12 @@
 """Constants for the opentherm_gw integration."""
 import pyotgw.vars as gw_vars
 
-from homeassistant.const import DEVICE_CLASS_TEMPERATURE, TEMP_CELSIUS
+from homeassistant.const import (
+    DEVICE_CLASS_TEMPERATURE,
+    TEMP_CELSIUS,
+    TIME_HOURS,
+    TIME_MINUTES,
+)
 
 ATTR_GW_ID = "gateway_id"
 ATTR_LEVEL = "level"
@@ -31,9 +36,8 @@ SERVICE_SET_OAT = "set_outside_temperature"
 SERVICE_SET_SB_TEMP = "set_setback_temperature"
 
 UNIT_BAR = "bar"
-UNIT_HOUR = "h"
 UNIT_KW = "kW"
-UNIT_L_MIN = "L/min"
+UNIT_L_MIN = f"L/{TIME_MINUTES}"
 UNIT_PERCENT = "%"
 
 BINARY_SENSOR_INFO = {
@@ -237,10 +241,10 @@ SENSOR_INFO = {
     gw_vars.DATA_CH_PUMP_STARTS: [None, None, "Central Heating Pump Starts {}"],
     gw_vars.DATA_DHW_PUMP_STARTS: [None, None, "Hot Water Pump Starts {}"],
     gw_vars.DATA_DHW_BURNER_STARTS: [None, None, "Hot Water Burner Starts {}"],
-    gw_vars.DATA_TOTAL_BURNER_HOURS: [None, UNIT_HOUR, "Total Burner Hours {}"],
-    gw_vars.DATA_CH_PUMP_HOURS: [None, UNIT_HOUR, "Central Heating Pump Hours {}"],
-    gw_vars.DATA_DHW_PUMP_HOURS: [None, UNIT_HOUR, "Hot Water Pump Hours {}"],
-    gw_vars.DATA_DHW_BURNER_HOURS: [None, UNIT_HOUR, "Hot Water Burner Hours {}"],
+    gw_vars.DATA_TOTAL_BURNER_HOURS: [None, TIME_HOURS, "Total Burner Hours {}"],
+    gw_vars.DATA_CH_PUMP_HOURS: [None, TIME_HOURS, "Central Heating Pump Hours {}"],
+    gw_vars.DATA_DHW_PUMP_HOURS: [None, TIME_HOURS, "Hot Water Pump Hours {}"],
+    gw_vars.DATA_DHW_BURNER_HOURS: [None, TIME_HOURS, "Hot Water Burner Hours {}"],
     gw_vars.DATA_MASTER_OT_VERSION: [None, None, "Thermostat OpenTherm Version {}"],
     gw_vars.DATA_SLAVE_OT_VERSION: [None, None, "Boiler OpenTherm Version {}"],
     gw_vars.DATA_MASTER_PRODUCT_TYPE: [None, None, "Thermostat Product Type {}"],
diff --git a/homeassistant/components/openuv/sensor.py b/homeassistant/components/openuv/sensor.py
index 2df62bcc09f..a375cfa10d7 100644
--- a/homeassistant/components/openuv/sensor.py
+++ b/homeassistant/components/openuv/sensor.py
@@ -1,6 +1,7 @@
 """Support for OpenUV sensors."""
 import logging
 
+from homeassistant.const import TIME_MINUTES
 from homeassistant.core import callback
 from homeassistant.helpers.dispatcher import async_dispatcher_connect
 from homeassistant.util.dt import as_local, parse_datetime
@@ -50,32 +51,32 @@ SENSORS = {
     TYPE_SAFE_EXPOSURE_TIME_1: (
         "Skin Type 1 Safe Exposure Time",
         "mdi:timer",
-        "minutes",
+        TIME_MINUTES,
     ),
     TYPE_SAFE_EXPOSURE_TIME_2: (
         "Skin Type 2 Safe Exposure Time",
         "mdi:timer",
-        "minutes",
+        TIME_MINUTES,
     ),
     TYPE_SAFE_EXPOSURE_TIME_3: (
         "Skin Type 3 Safe Exposure Time",
         "mdi:timer",
-        "minutes",
+        TIME_MINUTES,
     ),
     TYPE_SAFE_EXPOSURE_TIME_4: (
         "Skin Type 4 Safe Exposure Time",
         "mdi:timer",
-        "minutes",
+        TIME_MINUTES,
     ),
     TYPE_SAFE_EXPOSURE_TIME_5: (
         "Skin Type 5 Safe Exposure Time",
         "mdi:timer",
-        "minutes",
+        TIME_MINUTES,
     ),
     TYPE_SAFE_EXPOSURE_TIME_6: (
         "Skin Type 6 Safe Exposure Time",
         "mdi:timer",
-        "minutes",
+        TIME_MINUTES,
     ),
 }
 
diff --git a/homeassistant/components/openweathermap/sensor.py b/homeassistant/components/openweathermap/sensor.py
index 23f88f59aad..0fead516b7e 100644
--- a/homeassistant/components/openweathermap/sensor.py
+++ b/homeassistant/components/openweathermap/sensor.py
@@ -14,6 +14,7 @@ from homeassistant.const import (
     CONF_NAME,
     TEMP_CELSIUS,
     TEMP_FAHRENHEIT,
+    TIME_SECONDS,
 )
 import homeassistant.helpers.config_validation as cv
 from homeassistant.helpers.entity import Entity
@@ -33,7 +34,7 @@ MIN_TIME_BETWEEN_UPDATES = timedelta(seconds=120)
 SENSOR_TYPES = {
     "weather": ["Condition", None],
     "temperature": ["Temperature", None],
-    "wind_speed": ["Wind speed", "m/s"],
+    "wind_speed": ["Wind speed", f"m/{TIME_SECONDS}"],
     "wind_bearing": ["Wind bearing", "°"],
     "humidity": ["Humidity", "%"],
     "pressure": ["Pressure", "mbar"],
diff --git a/homeassistant/components/raincloud/__init__.py b/homeassistant/components/raincloud/__init__.py
index dd851c0b3e3..41fefbe8fca 100644
--- a/homeassistant/components/raincloud/__init__.py
+++ b/homeassistant/components/raincloud/__init__.py
@@ -11,6 +11,8 @@ from homeassistant.const import (
     CONF_PASSWORD,
     CONF_SCAN_INTERVAL,
     CONF_USERNAME,
+    TIME_DAYS,
+    TIME_MINUTES,
 )
 import homeassistant.helpers.config_validation as cv
 from homeassistant.helpers.dispatcher import async_dispatcher_connect, dispatcher_send
@@ -60,9 +62,9 @@ UNIT_OF_MEASUREMENT_MAP = {
     "is_watering": "",
     "manual_watering": "",
     "next_cycle": "",
-    "rain_delay": "days",
+    "rain_delay": TIME_DAYS,
     "status": "",
-    "watering_time": "min",
+    "watering_time": TIME_MINUTES,
 }
 
 BINARY_SENSORS = ["is_watering", "status"]
diff --git a/homeassistant/components/rejseplanen/sensor.py b/homeassistant/components/rejseplanen/sensor.py
index 419600ce562..8fdd1f2f858 100644
--- a/homeassistant/components/rejseplanen/sensor.py
+++ b/homeassistant/components/rejseplanen/sensor.py
@@ -12,7 +12,7 @@ import rjpl
 import voluptuous as vol
 
 from homeassistant.components.sensor import PLATFORM_SCHEMA
-from homeassistant.const import ATTR_ATTRIBUTION, CONF_NAME
+from homeassistant.const import ATTR_ATTRIBUTION, CONF_NAME, TIME_MINUTES
 import homeassistant.helpers.config_validation as cv
 from homeassistant.helpers.entity import Entity
 import homeassistant.util.dt as dt_util
@@ -130,7 +130,7 @@ class RejseplanenTransportSensor(Entity):
     @property
     def unit_of_measurement(self):
         """Return the unit this state is expressed in."""
-        return "min"
+        return TIME_MINUTES
 
     @property
     def icon(self):
diff --git a/homeassistant/components/rmvtransport/sensor.py b/homeassistant/components/rmvtransport/sensor.py
index 507e3c133cc..704bde67a5c 100644
--- a/homeassistant/components/rmvtransport/sensor.py
+++ b/homeassistant/components/rmvtransport/sensor.py
@@ -8,7 +8,7 @@ from RMVtransport.rmvtransport import RMVtransportApiConnectionError
 import voluptuous as vol
 
 from homeassistant.components.sensor import PLATFORM_SCHEMA
-from homeassistant.const import ATTR_ATTRIBUTION, CONF_NAME
+from homeassistant.const import ATTR_ATTRIBUTION, CONF_NAME, TIME_MINUTES
 from homeassistant.exceptions import PlatformNotReady
 from homeassistant.helpers.aiohttp_client import async_get_clientsession
 import homeassistant.helpers.config_validation as cv
@@ -177,7 +177,7 @@ class RMVDepartureSensor(Entity):
     @property
     def unit_of_measurement(self):
         """Return the unit this state is expressed in."""
-        return "min"
+        return TIME_MINUTES
 
     async def async_update(self):
         """Get the latest data and update the state."""
diff --git a/homeassistant/components/saj/sensor.py b/homeassistant/components/saj/sensor.py
index 797780d562a..55c2371aabb 100644
--- a/homeassistant/components/saj/sensor.py
+++ b/homeassistant/components/saj/sensor.py
@@ -22,6 +22,7 @@ from homeassistant.const import (
     POWER_WATT,
     TEMP_CELSIUS,
     TEMP_FAHRENHEIT,
+    TIME_HOURS,
 )
 from homeassistant.core import CALLBACK_TYPE, callback
 from homeassistant.exceptions import PlatformNotReady
@@ -34,13 +35,11 @@ _LOGGER = logging.getLogger(__name__)
 MIN_INTERVAL = 5
 MAX_INTERVAL = 300
 
-UNIT_OF_MEASUREMENT_HOURS = "h"
-
 INVERTER_TYPES = ["ethernet", "wifi"]
 
 SAJ_UNIT_MAPPINGS = {
     "": None,
-    "h": UNIT_OF_MEASUREMENT_HOURS,
+    "h": TIME_HOURS,
     "kg": MASS_KILOGRAMS,
     "kWh": ENERGY_KILO_WATT_HOUR,
     "W": POWER_WATT,
diff --git a/homeassistant/components/speedtestdotnet/const.py b/homeassistant/components/speedtestdotnet/const.py
index a08c9421c76..2fed2609fb3 100644
--- a/homeassistant/components/speedtestdotnet/const.py
+++ b/homeassistant/components/speedtestdotnet/const.py
@@ -1,12 +1,12 @@
 """Consts used by Speedtest.net."""
 
-from homeassistant.const import DATA_RATE_MEGABITS_PER_SECOND
+from homeassistant.const import DATA_RATE_MEGABITS_PER_SECOND, TIME_MILLISECONDS
 
 DOMAIN = "speedtestdotnet"
 DATA_UPDATED = f"{DOMAIN}_data_updated"
 
 SENSOR_TYPES = {
-    "ping": ["Ping", "ms"],
+    "ping": ["Ping", TIME_MILLISECONDS],
     "download": ["Download", DATA_RATE_MEGABITS_PER_SECOND],
     "upload": ["Upload", DATA_RATE_MEGABITS_PER_SECOND],
 }
diff --git a/homeassistant/components/tellduslive/sensor.py b/homeassistant/components/tellduslive/sensor.py
index 7d9f940f391..e3cb1e48c37 100644
--- a/homeassistant/components/tellduslive/sensor.py
+++ b/homeassistant/components/tellduslive/sensor.py
@@ -8,6 +8,8 @@ from homeassistant.const import (
     DEVICE_CLASS_TEMPERATURE,
     POWER_WATT,
     TEMP_CELSIUS,
+    TIME_HOURS,
+    TIME_SECONDS,
 )
 from homeassistant.helpers.dispatcher import async_dispatcher_connect
 
@@ -36,11 +38,11 @@ SENSOR_TYPES = {
         DEVICE_CLASS_TEMPERATURE,
     ],
     SENSOR_TYPE_HUMIDITY: ["Humidity", "%", None, DEVICE_CLASS_HUMIDITY],
-    SENSOR_TYPE_RAINRATE: ["Rain rate", "mm/h", "mdi:water", None],
+    SENSOR_TYPE_RAINRATE: ["Rain rate", f"mm/{TIME_HOURS}", "mdi:water", None],
     SENSOR_TYPE_RAINTOTAL: ["Rain total", "mm", "mdi:water", None],
     SENSOR_TYPE_WINDDIRECTION: ["Wind direction", "", "", None],
-    SENSOR_TYPE_WINDAVERAGE: ["Wind average", "m/s", "", None],
-    SENSOR_TYPE_WINDGUST: ["Wind gust", "m/s", "", None],
+    SENSOR_TYPE_WINDAVERAGE: ["Wind average", f"m/{TIME_SECONDS}", "", None],
+    SENSOR_TYPE_WINDGUST: ["Wind gust", f"m/{TIME_SECONDS}", "", None],
     SENSOR_TYPE_UV: ["UV", "UV", "", None],
     SENSOR_TYPE_WATT: ["Power", POWER_WATT, "", None],
     SENSOR_TYPE_LUMINANCE: ["Luminance", "lx", None, DEVICE_CLASS_ILLUMINANCE],
diff --git a/homeassistant/components/tmb/sensor.py b/homeassistant/components/tmb/sensor.py
index 6d8bdc7eac7..8eb0673aa73 100644
--- a/homeassistant/components/tmb/sensor.py
+++ b/homeassistant/components/tmb/sensor.py
@@ -7,7 +7,7 @@ from tmb import IBus
 import voluptuous as vol
 
 from homeassistant.components.sensor import PLATFORM_SCHEMA
-from homeassistant.const import ATTR_ATTRIBUTION, CONF_NAME
+from homeassistant.const import ATTR_ATTRIBUTION, CONF_NAME, TIME_MINUTES
 import homeassistant.helpers.config_validation as cv
 from homeassistant.helpers.entity import Entity
 from homeassistant.util import Throttle
@@ -72,7 +72,7 @@ class TMBSensor(Entity):
         self._stop = stop
         self._line = line.upper()
         self._name = name
-        self._unit = "minutes"
+        self._unit = TIME_MINUTES
         self._state = None
 
     @property
diff --git a/homeassistant/components/trafikverket_weatherstation/sensor.py b/homeassistant/components/trafikverket_weatherstation/sensor.py
index 802bb897b96..b57a24d0ced 100644
--- a/homeassistant/components/trafikverket_weatherstation/sensor.py
+++ b/homeassistant/components/trafikverket_weatherstation/sensor.py
@@ -17,6 +17,7 @@ from homeassistant.const import (
     DEVICE_CLASS_HUMIDITY,
     DEVICE_CLASS_TEMPERATURE,
     TEMP_CELSIUS,
+    TIME_SECONDS,
 )
 from homeassistant.helpers.aiohttp_client import async_get_clientsession
 import homeassistant.helpers.config_validation as cv
@@ -71,7 +72,13 @@ SENSOR_TYPES = {
         "mdi:flag-triangle",
         None,
     ],
-    "wind_speed": ["Wind speed", "m/s", "windforce", "mdi:weather-windy", None],
+    "wind_speed": [
+        "Wind speed",
+        f"m/{TIME_SECONDS}",
+        "windforce",
+        "mdi:weather-windy",
+        None,
+    ],
     "humidity": [
         "Humidity",
         "%",
diff --git a/homeassistant/components/transport_nsw/sensor.py b/homeassistant/components/transport_nsw/sensor.py
index 7c6990de085..e877e2d2e43 100644
--- a/homeassistant/components/transport_nsw/sensor.py
+++ b/homeassistant/components/transport_nsw/sensor.py
@@ -6,7 +6,13 @@ from TransportNSW import TransportNSW
 import voluptuous as vol
 
 from homeassistant.components.sensor import PLATFORM_SCHEMA
-from homeassistant.const import ATTR_ATTRIBUTION, ATTR_MODE, CONF_API_KEY, CONF_NAME
+from homeassistant.const import (
+    ATTR_ATTRIBUTION,
+    ATTR_MODE,
+    CONF_API_KEY,
+    CONF_NAME,
+    TIME_MINUTES,
+)
 import homeassistant.helpers.config_validation as cv
 from homeassistant.helpers.entity import Entity
 
@@ -101,7 +107,7 @@ class TransportNSWSensor(Entity):
     @property
     def unit_of_measurement(self):
         """Return the unit this state is expressed in."""
-        return "min"
+        return TIME_MINUTES
 
     @property
     def icon(self):
diff --git a/homeassistant/components/travisci/sensor.py b/homeassistant/components/travisci/sensor.py
index ba698c2b64d..ffbe5239cc9 100644
--- a/homeassistant/components/travisci/sensor.py
+++ b/homeassistant/components/travisci/sensor.py
@@ -12,6 +12,7 @@ from homeassistant.const import (
     CONF_API_KEY,
     CONF_MONITORED_CONDITIONS,
     CONF_SCAN_INTERVAL,
+    TIME_SECONDS,
 )
 import homeassistant.helpers.config_validation as cv
 from homeassistant.helpers.entity import Entity
@@ -30,7 +31,7 @@ SCAN_INTERVAL = timedelta(seconds=30)
 # sensor_type [ description, unit, icon ]
 SENSOR_TYPES = {
     "last_build_id": ["Last Build ID", "", "mdi:account-card-details"],
-    "last_build_duration": ["Last Build Duration", "sec", "mdi:timelapse"],
+    "last_build_duration": ["Last Build Duration", TIME_SECONDS, "mdi:timelapse"],
     "last_build_finished_at": ["Last Build Finished At", "", "mdi:timetable"],
     "last_build_started_at": ["Last Build Started At", "", "mdi:timetable"],
     "last_build_state": ["Last Build State", "", "mdi:github-circle"],
diff --git a/homeassistant/components/uk_transport/sensor.py b/homeassistant/components/uk_transport/sensor.py
index 77b1c1a6f11..77929436283 100644
--- a/homeassistant/components/uk_transport/sensor.py
+++ b/homeassistant/components/uk_transport/sensor.py
@@ -7,7 +7,7 @@ import requests
 import voluptuous as vol
 
 from homeassistant.components.sensor import PLATFORM_SCHEMA
-from homeassistant.const import CONF_MODE
+from homeassistant.const import CONF_MODE, TIME_MINUTES
 import homeassistant.helpers.config_validation as cv
 from homeassistant.helpers.entity import Entity
 from homeassistant.util import Throttle
@@ -119,7 +119,7 @@ class UkTransportSensor(Entity):
     @property
     def unit_of_measurement(self):
         """Return the unit this state is expressed in."""
-        return "min"
+        return TIME_MINUTES
 
     @property
     def icon(self):
diff --git a/homeassistant/components/upnp/sensor.py b/homeassistant/components/upnp/sensor.py
index db121678d93..fdb5bc5100a 100644
--- a/homeassistant/components/upnp/sensor.py
+++ b/homeassistant/components/upnp/sensor.py
@@ -1,6 +1,7 @@
 """Support for UPnP/IGD Sensors."""
 import logging
 
+from homeassistant.const import TIME_SECONDS
 from homeassistant.core import callback
 from homeassistant.helpers import device_registry as dr
 from homeassistant.helpers.dispatcher import async_dispatcher_connect
@@ -192,7 +193,7 @@ class PerSecondUPnPIGDSensor(UpnpSensor):
     @property
     def unit_of_measurement(self) -> str:
         """Return the unit of measurement of this entity, if any."""
-        return f"{self.unit}/s"
+        return f"{self.unit}/{TIME_SECONDS}"
 
     def _is_overflowed(self, new_value) -> bool:
         """Check if value has overflowed."""
diff --git a/homeassistant/components/viaggiatreno/sensor.py b/homeassistant/components/viaggiatreno/sensor.py
index ef05bcf2adb..783581a0755 100644
--- a/homeassistant/components/viaggiatreno/sensor.py
+++ b/homeassistant/components/viaggiatreno/sensor.py
@@ -7,7 +7,7 @@ import async_timeout
 import voluptuous as vol
 
 from homeassistant.components.sensor import PLATFORM_SCHEMA
-from homeassistant.const import ATTR_ATTRIBUTION
+from homeassistant.const import ATTR_ATTRIBUTION, TIME_MINUTES
 import homeassistant.helpers.config_validation as cv
 from homeassistant.helpers.entity import Entity
 
@@ -177,5 +177,5 @@ class ViaggiaTrenoSensor(Entity):
                 self._unit = ""
             else:
                 self._state = res.get("ritardo")
-                self._unit = "min"
+                self._unit = TIME_MINUTES
                 self._icon = ICON
diff --git a/homeassistant/components/waze_travel_time/sensor.py b/homeassistant/components/waze_travel_time/sensor.py
index b9ca64c0970..0357825cb12 100644
--- a/homeassistant/components/waze_travel_time/sensor.py
+++ b/homeassistant/components/waze_travel_time/sensor.py
@@ -16,6 +16,7 @@ from homeassistant.const import (
     CONF_UNIT_SYSTEM_IMPERIAL,
     CONF_UNIT_SYSTEM_METRIC,
     EVENT_HOMEASSISTANT_START,
+    TIME_MINUTES,
 )
 from homeassistant.helpers import location
 import homeassistant.helpers.config_validation as cv
@@ -167,7 +168,7 @@ class WazeTravelTime(Entity):
     @property
     def unit_of_measurement(self):
         """Return the unit of measurement."""
-        return "min"
+        return TIME_MINUTES
 
     @property
     def icon(self):
diff --git a/homeassistant/components/whois/sensor.py b/homeassistant/components/whois/sensor.py
index dc9da1100f0..7ec5c3dac5e 100644
--- a/homeassistant/components/whois/sensor.py
+++ b/homeassistant/components/whois/sensor.py
@@ -6,7 +6,7 @@ import voluptuous as vol
 import whois
 
 from homeassistant.components.sensor import PLATFORM_SCHEMA
-from homeassistant.const import CONF_NAME
+from homeassistant.const import CONF_NAME, TIME_DAYS
 import homeassistant.helpers.config_validation as cv
 from homeassistant.helpers.entity import Entity
 
@@ -75,7 +75,7 @@ class WhoisSensor(Entity):
     @property
     def unit_of_measurement(self):
         """Return the unit of measurement to present the value in."""
-        return "days"
+        return TIME_DAYS
 
     @property
     def state(self):
diff --git a/homeassistant/components/withings/const.py b/homeassistant/components/withings/const.py
index 856f50ce9ad..82081eee2fa 100644
--- a/homeassistant/components/withings/const.py
+++ b/homeassistant/components/withings/const.py
@@ -61,10 +61,9 @@ MEAS_WEIGHT_KG = "weight_kg"
 UOM_BEATS_PER_MINUTE = "bpm"
 UOM_BREATHS_PER_MINUTE = "br/m"
 UOM_FREQUENCY = "times"
-UOM_METERS_PER_SECOND = "m/s"
+UOM_METERS_PER_SECOND = f"m/{const.TIME_SECONDS}"
 UOM_MMHG = "mmhg"
 UOM_PERCENT = "%"
 UOM_LENGTH_M = const.LENGTH_METERS
 UOM_MASS_KG = const.MASS_KILOGRAMS
-UOM_SECONDS = "seconds"
 UOM_TEMP_C = const.TEMP_CELSIUS
diff --git a/homeassistant/components/withings/sensor.py b/homeassistant/components/withings/sensor.py
index ea570569fa6..c690580ffa4 100644
--- a/homeassistant/components/withings/sensor.py
+++ b/homeassistant/components/withings/sensor.py
@@ -13,6 +13,7 @@ from withings_api.common import (
 )
 
 from homeassistant.config_entries import ConfigEntry
+from homeassistant.const import TIME_SECONDS
 from homeassistant.core import HomeAssistant
 from homeassistant.helpers import config_entry_oauth2_flow
 from homeassistant.helpers.entity import Entity
@@ -197,28 +198,28 @@ WITHINGS_ATTRIBUTES = [
         const.MEAS_SLEEP_WAKEUP_DURATION_SECONDS,
         GetSleepSummaryField.WAKEUP_DURATION.value,
         "Wakeup time",
-        const.UOM_SECONDS,
+        TIME_SECONDS,
         "mdi:sleep-off",
     ),
     WithingsSleepSummaryAttribute(
         const.MEAS_SLEEP_LIGHT_DURATION_SECONDS,
         GetSleepSummaryField.LIGHT_SLEEP_DURATION.value,
         "Light sleep",
-        const.UOM_SECONDS,
+        TIME_SECONDS,
         "mdi:sleep",
     ),
     WithingsSleepSummaryAttribute(
         const.MEAS_SLEEP_DEEP_DURATION_SECONDS,
         GetSleepSummaryField.DEEP_SLEEP_DURATION.value,
         "Deep sleep",
-        const.UOM_SECONDS,
+        TIME_SECONDS,
         "mdi:sleep",
     ),
     WithingsSleepSummaryAttribute(
         const.MEAS_SLEEP_REM_DURATION_SECONDS,
         GetSleepSummaryField.REM_SLEEP_DURATION.value,
         "REM sleep",
-        const.UOM_SECONDS,
+        TIME_SECONDS,
         "mdi:sleep",
     ),
     WithingsSleepSummaryAttribute(
@@ -232,14 +233,14 @@ WITHINGS_ATTRIBUTES = [
         const.MEAS_SLEEP_TOSLEEP_DURATION_SECONDS,
         GetSleepSummaryField.DURATION_TO_SLEEP.value,
         "Time to sleep",
-        const.UOM_SECONDS,
+        TIME_SECONDS,
         "mdi:sleep",
     ),
     WithingsSleepSummaryAttribute(
         const.MEAS_SLEEP_TOWAKEUP_DURATION_SECONDS,
         GetSleepSummaryField.DURATION_TO_WAKEUP.value,
         "Time to wakeup",
-        const.UOM_SECONDS,
+        TIME_SECONDS,
         "mdi:sleep-off",
     ),
     WithingsSleepSummaryAttribute(
diff --git a/homeassistant/components/wsdot/sensor.py b/homeassistant/components/wsdot/sensor.py
index 5afa3a3efcf..6ee55aa387f 100644
--- a/homeassistant/components/wsdot/sensor.py
+++ b/homeassistant/components/wsdot/sensor.py
@@ -13,6 +13,7 @@ from homeassistant.const import (
     CONF_API_KEY,
     CONF_ID,
     CONF_NAME,
+    TIME_MINUTES,
 )
 import homeassistant.helpers.config_validation as cv
 from homeassistant.helpers.entity import Entity
@@ -137,7 +138,7 @@ class WashingtonStateTravelTimeSensor(WashingtonStateTransportSensor):
     @property
     def unit_of_measurement(self):
         """Return the unit this state is expressed in."""
-        return "min"
+        return TIME_MINUTES
 
 
 def _parse_wsdot_timestamp(timestamp):
diff --git a/homeassistant/components/yr/sensor.py b/homeassistant/components/yr/sensor.py
index c9392561fc8..63fe4012fe5 100644
--- a/homeassistant/components/yr/sensor.py
+++ b/homeassistant/components/yr/sensor.py
@@ -22,6 +22,7 @@ from homeassistant.const import (
     DEVICE_CLASS_TEMPERATURE,
     PRESSURE_HPA,
     TEMP_CELSIUS,
+    TIME_SECONDS,
 )
 from homeassistant.helpers.aiohttp_client import async_get_clientsession
 import homeassistant.helpers.config_validation as cv
@@ -41,8 +42,8 @@ SENSOR_TYPES = {
     "symbol": ["Symbol", None, None],
     "precipitation": ["Precipitation", "mm", None],
     "temperature": ["Temperature", TEMP_CELSIUS, DEVICE_CLASS_TEMPERATURE],
-    "windSpeed": ["Wind speed", "m/s", None],
-    "windGust": ["Wind gust", "m/s", None],
+    "windSpeed": ["Wind speed", f"m/{TIME_SECONDS}", None],
+    "windGust": ["Wind gust", f"m/{TIME_SECONDS}", None],
     "pressure": ["Pressure", PRESSURE_HPA, DEVICE_CLASS_PRESSURE],
     "windDirection": ["Wind direction", "°", None],
     "humidity": ["Humidity", "%", DEVICE_CLASS_HUMIDITY],
diff --git a/homeassistant/components/zamg/sensor.py b/homeassistant/components/zamg/sensor.py
index 44c216eb1be..6e96d28e176 100644
--- a/homeassistant/components/zamg/sensor.py
+++ b/homeassistant/components/zamg/sensor.py
@@ -17,6 +17,7 @@ from homeassistant.const import (
     CONF_LONGITUDE,
     CONF_MONITORED_CONDITIONS,
     CONF_NAME,
+    TIME_HOURS,
     __version__,
 )
 import homeassistant.helpers.config_validation as cv
@@ -39,9 +40,14 @@ SENSOR_TYPES = {
     "pressure": ("Pressure", "hPa", "LDstat hPa", float),
     "pressure_sealevel": ("Pressure at Sea Level", "hPa", "LDred hPa", float),
     "humidity": ("Humidity", "%", "RF %", int),
-    "wind_speed": ("Wind Speed", "km/h", "WG km/h", float),
+    "wind_speed": ("Wind Speed", f"km/{TIME_HOURS}", f"WG km/{TIME_HOURS}", float),
     "wind_bearing": ("Wind Bearing", "°", "WR °", int),
-    "wind_max_speed": ("Top Wind Speed", "km/h", "WSG km/h", float),
+    "wind_max_speed": (
+        "Top Wind Speed",
+        f"km/{TIME_HOURS}",
+        f"WSG km/{TIME_HOURS}",
+        float,
+    ),
     "wind_max_bearing": ("Top Wind Bearing", "°", "WSR °", int),
     "sun_last_hour": ("Sun Last Hour", "%", "SO %", int),
     "temperature": ("Temperature", "°C", "T °C", float),
diff --git a/homeassistant/components/zha/core/channels/smartenergy.py b/homeassistant/components/zha/core/channels/smartenergy.py
index b738b665e80..c7cad5e455d 100644
--- a/homeassistant/components/zha/core/channels/smartenergy.py
+++ b/homeassistant/components/zha/core/channels/smartenergy.py
@@ -3,6 +3,7 @@ import logging
 
 import zigpy.zcl.clusters.smartenergy as smartenergy
 
+from homeassistant.const import TIME_HOURS, TIME_SECONDS
 from homeassistant.core import callback
 
 from .. import registries, typing as zha_typing
@@ -76,18 +77,18 @@ class Metering(AttributeListeningChannel):
 
     unit_of_measure_map = {
         0x00: "kW",
-        0x01: "m³/h",
-        0x02: "ft³/h",
-        0x03: "ccf/h",
-        0x04: "US gal/h",
-        0x05: "IMP gal/h",
-        0x06: "BTU/h",
-        0x07: "l/h",
+        0x01: f"m³/{TIME_HOURS}",
+        0x02: f"ft³/{TIME_HOURS}",
+        0x03: f"ccf/{TIME_HOURS}",
+        0x04: f"US gal/{TIME_HOURS}",
+        0x05: f"IMP gal/{TIME_HOURS}",
+        0x06: f"BTU/{TIME_HOURS}",
+        0x07: f"l/{TIME_HOURS}",
         0x08: "kPa",
         0x09: "kPa",
-        0x0A: "mcf/h",
+        0x0A: f"mcf/{TIME_HOURS}",
         0x0B: "unitless",
-        0x0C: "MJ/s",
+        0x0C: f"MJ/{TIME_SECONDS}",
     }
 
     def __init__(
diff --git a/homeassistant/const.py b/homeassistant/const.py
index 50ce3e084b8..32dfac973a2 100644
--- a/homeassistant/const.py
+++ b/homeassistant/const.py
@@ -343,6 +343,17 @@ ENERGY_WATT_HOUR = "Wh"
 TEMP_CELSIUS = "°C"
 TEMP_FAHRENHEIT = "°F"
 
+# Time units
+TIME_MICROSECONDS = "μs"
+TIME_MILLISECONDS = "ms"
+TIME_SECONDS = "s"
+TIME_MINUTES = "min"
+TIME_HOURS = "h"
+TIME_DAYS = "d"
+TIME_WEEKS = "w"
+TIME_MONTHS = "m"
+TIME_YEARS = "y"
+
 # Length units
 LENGTH_CENTIMETERS: str = "cm"
 LENGTH_METERS: str = "m"
@@ -400,17 +411,17 @@ DATA_PEBIBYTES = "PiB"
 DATA_EXBIBYTES = "EiB"
 DATA_ZEBIBYTES = "ZiB"
 DATA_YOBIBYTES = "YiB"
-DATA_RATE_BITS_PER_SECOND = f"{DATA_BITS}/s"
-DATA_RATE_KILOBITS_PER_SECOND = f"{DATA_KILOBITS}/s"
-DATA_RATE_MEGABITS_PER_SECOND = f"{DATA_MEGABITS}/s"
-DATA_RATE_GIGABITS_PER_SECOND = f"{DATA_GIGABITS}/s"
-DATA_RATE_BYTES_PER_SECOND = f"{DATA_BYTES}/s"
-DATA_RATE_KILOBYTES_PER_SECOND = f"{DATA_KILOBYTES}/s"
-DATA_RATE_MEGABYTES_PER_SECOND = f"{DATA_MEGABYTES}/s"
-DATA_RATE_GIGABYTES_PER_SECOND = f"{DATA_GIGABYTES}/s"
-DATA_RATE_KIBIBYTES_PER_SECOND = f"{DATA_KIBIBYTES}/s"
-DATA_RATE_MEBIBYTES_PER_SECOND = f"{DATA_MEBIBYTES}/s"
-DATA_RATE_GIBIBYTES_PER_SECOND = f"{DATA_GIBIBYTES}/s"
+DATA_RATE_BITS_PER_SECOND = f"{DATA_BITS}/{TIME_SECONDS}"
+DATA_RATE_KILOBITS_PER_SECOND = f"{DATA_KILOBITS}/{TIME_SECONDS}"
+DATA_RATE_MEGABITS_PER_SECOND = f"{DATA_MEGABITS}/{TIME_SECONDS}"
+DATA_RATE_GIGABITS_PER_SECOND = f"{DATA_GIGABITS}/{TIME_SECONDS}"
+DATA_RATE_BYTES_PER_SECOND = f"{DATA_BYTES}/{TIME_SECONDS}"
+DATA_RATE_KILOBYTES_PER_SECOND = f"{DATA_KILOBYTES}/{TIME_SECONDS}"
+DATA_RATE_MEGABYTES_PER_SECOND = f"{DATA_MEGABYTES}/{TIME_SECONDS}"
+DATA_RATE_GIGABYTES_PER_SECOND = f"{DATA_GIGABYTES}/{TIME_SECONDS}"
+DATA_RATE_KIBIBYTES_PER_SECOND = f"{DATA_KIBIBYTES}/{TIME_SECONDS}"
+DATA_RATE_MEBIBYTES_PER_SECOND = f"{DATA_MEBIBYTES}/{TIME_SECONDS}"
+DATA_RATE_GIBIBYTES_PER_SECOND = f"{DATA_GIBIBYTES}/{TIME_SECONDS}"
 
 # #### SERVICES ####
 SERVICE_HOMEASSISTANT_STOP = "stop"
diff --git a/tests/components/derivative/test_sensor.py b/tests/components/derivative/test_sensor.py
index 9a26d2de5ce..dc160b283ad 100644
--- a/tests/components/derivative/test_sensor.py
+++ b/tests/components/derivative/test_sensor.py
@@ -2,6 +2,7 @@
 from datetime import timedelta
 from unittest.mock import patch
 
+from homeassistant.const import TIME_HOURS, TIME_MINUTES, TIME_SECONDS
 from homeassistant.setup import async_setup_component
 import homeassistant.util.dt as dt_util
 
@@ -79,7 +80,7 @@ async def test_dataSet1(hass):
     """Test derivative sensor state."""
     await setup_tests(
         hass,
-        {"unit_time": "s"},
+        {"unit_time": TIME_SECONDS},
         times=[20, 30, 40, 50],
         values=[10, 30, 5, 0],
         expected_state=-0.5,
@@ -89,30 +90,46 @@ async def test_dataSet1(hass):
 async def test_dataSet2(hass):
     """Test derivative sensor state."""
     await setup_tests(
-        hass, {"unit_time": "s"}, times=[20, 30], values=[5, 0], expected_state=-0.5
+        hass,
+        {"unit_time": TIME_SECONDS},
+        times=[20, 30],
+        values=[5, 0],
+        expected_state=-0.5,
     )
 
 
 async def test_dataSet3(hass):
     """Test derivative sensor state."""
     state = await setup_tests(
-        hass, {"unit_time": "s"}, times=[20, 30], values=[5, 10], expected_state=0.5
+        hass,
+        {"unit_time": TIME_SECONDS},
+        times=[20, 30],
+        values=[5, 10],
+        expected_state=0.5,
     )
 
-    assert state.attributes.get("unit_of_measurement") == "/s"
+    assert state.attributes.get("unit_of_measurement") == f"/{TIME_SECONDS}"
 
 
 async def test_dataSet4(hass):
     """Test derivative sensor state."""
     await setup_tests(
-        hass, {"unit_time": "s"}, times=[20, 30], values=[5, 5], expected_state=0
+        hass,
+        {"unit_time": TIME_SECONDS},
+        times=[20, 30],
+        values=[5, 5],
+        expected_state=0,
     )
 
 
 async def test_dataSet5(hass):
     """Test derivative sensor state."""
     await setup_tests(
-        hass, {"unit_time": "s"}, times=[20, 30], values=[10, -10], expected_state=-2
+        hass,
+        {"unit_time": TIME_SECONDS},
+        times=[20, 30],
+        values=[10, -10],
+        expected_state=-2,
     )
 
 
@@ -137,7 +154,12 @@ async def test_data_moving_average_for_discrete_sensor(hass):
     times = list(range(0, 1800 + 30, 30))
 
     config, entity_id = await _setup_sensor(
-        hass, {"time_window": {"seconds": time_window}, "unit_time": "min", "round": 1}
+        hass,
+        {
+            "time_window": {"seconds": time_window},
+            "unit_time": TIME_MINUTES,
+            "round": 1,
+        },
     )  # two minute window
 
     for time, value in zip(times, temperature_values):
@@ -186,7 +208,7 @@ async def test_prefix(hass):
 
     # Testing a power sensor at 1000 Watts for 1hour = 0kW/h
     assert round(float(state.state), config["sensor"]["round"]) == 0.0
-    assert state.attributes.get("unit_of_measurement") == "kW/h"
+    assert state.attributes.get("unit_of_measurement") == f"kW/{TIME_HOURS}"
 
 
 async def test_suffix(hass):
@@ -198,7 +220,7 @@ async def test_suffix(hass):
             "source": "sensor.bytes_per_second",
             "round": 2,
             "unit_prefix": "k",
-            "unit_time": "s",
+            "unit_time": TIME_SECONDS,
         }
     }
 
diff --git a/tests/components/dsmr/test_sensor.py b/tests/components/dsmr/test_sensor.py
index c881f4b9168..e3d5e62f435 100644
--- a/tests/components/dsmr/test_sensor.py
+++ b/tests/components/dsmr/test_sensor.py
@@ -15,6 +15,7 @@ import pytest
 
 from homeassistant.bootstrap import async_setup_component
 from homeassistant.components.dsmr.sensor import DerivativeDSMREntity
+from homeassistant.const import TIME_HOURS
 
 from tests.common import assert_setup_component
 
@@ -140,7 +141,7 @@ async def test_derivative():
         abs(entity.state - 0.033) < 0.00001
     ), "state should be hourly usage calculated from first and second update"
 
-    assert entity.unit_of_measurement == "m3/h"
+    assert entity.unit_of_measurement == f"m3/{TIME_HOURS}"
 
 
 async def test_v4_meter(hass, mock_connection_factory):
@@ -240,9 +241,7 @@ async def test_belgian_meter_low(hass, mock_connection_factory):
 
     config = {"platform": "dsmr", "dsmr_version": "5B"}
 
-    telegram = {
-        ELECTRICITY_ACTIVE_TARIFF: CosemObject([{"value": "0002", "unit": ""}]),
-    }
+    telegram = {ELECTRICITY_ACTIVE_TARIFF: CosemObject([{"value": "0002", "unit": ""}])}
 
     with assert_setup_component(1):
         await async_setup_component(hass, "sensor", {"sensor": config})
diff --git a/tests/components/dyson/test_sensor.py b/tests/components/dyson/test_sensor.py
index 442ea913b46..e540d304731 100644
--- a/tests/components/dyson/test_sensor.py
+++ b/tests/components/dyson/test_sensor.py
@@ -8,7 +8,7 @@ from libpurecool.dyson_pure_cool_link import DysonPureCoolLink
 
 from homeassistant.components import dyson as dyson_parent
 from homeassistant.components.dyson import sensor as dyson
-from homeassistant.const import STATE_OFF, TEMP_CELSIUS, TEMP_FAHRENHEIT
+from homeassistant.const import STATE_OFF, TEMP_CELSIUS, TEMP_FAHRENHEIT, TIME_HOURS
 from homeassistant.helpers import discovery
 from homeassistant.setup import async_setup_component
 
@@ -123,7 +123,7 @@ class DysonTest(unittest.TestCase):
         sensor.entity_id = "sensor.dyson_1"
         assert not sensor.should_poll
         assert sensor.state is None
-        assert sensor.unit_of_measurement == "hours"
+        assert sensor.unit_of_measurement == TIME_HOURS
         assert sensor.name == "Device_name Filter Life"
         assert sensor.entity_id == "sensor.dyson_1"
         sensor.on_message("message")
@@ -135,7 +135,7 @@ class DysonTest(unittest.TestCase):
         sensor.entity_id = "sensor.dyson_1"
         assert not sensor.should_poll
         assert sensor.state == 100
-        assert sensor.unit_of_measurement == "hours"
+        assert sensor.unit_of_measurement == TIME_HOURS
         assert sensor.name == "Device_name Filter Life"
         assert sensor.entity_id == "sensor.dyson_1"
         sensor.on_message("message")
diff --git a/tests/components/here_travel_time/test_sensor.py b/tests/components/here_travel_time/test_sensor.py
index 4456b256f6e..fcae8bd1f8c 100644
--- a/tests/components/here_travel_time/test_sensor.py
+++ b/tests/components/here_travel_time/test_sensor.py
@@ -28,6 +28,7 @@ from homeassistant.components.here_travel_time.sensor import (
     ROUTE_MODE_FASTEST,
     ROUTE_MODE_SHORTEST,
     SCAN_INTERVAL,
+    TIME_MINUTES,
     TRAFFIC_MODE_DISABLED,
     TRAFFIC_MODE_ENABLED,
     TRAVEL_MODE_BICYCLE,
@@ -36,7 +37,6 @@ from homeassistant.components.here_travel_time.sensor import (
     TRAVEL_MODE_PUBLIC,
     TRAVEL_MODE_PUBLIC_TIME_TABLE,
     TRAVEL_MODE_TRUCK,
-    UNIT_OF_MEASUREMENT,
 )
 from homeassistant.const import ATTR_ICON, EVENT_HOMEASSISTANT_START
 from homeassistant.setup import async_setup_component
@@ -83,7 +83,7 @@ def _build_mock_url(origin, destination, modes, api_key, departure):
 def _assert_truck_sensor(sensor):
     """Assert that states and attributes are correct for truck_response."""
     assert sensor.state == "14"
-    assert sensor.attributes.get("unit_of_measurement") == UNIT_OF_MEASUREMENT
+    assert sensor.attributes.get("unit_of_measurement") == TIME_MINUTES
 
     assert sensor.attributes.get(ATTR_ATTRIBUTION) is None
     assert sensor.attributes.get(ATTR_DURATION) == 13.533333333333333
@@ -177,7 +177,7 @@ async def test_car(hass, requests_mock_car_disabled_response):
 
     sensor = hass.states.get("sensor.test")
     assert sensor.state == "30"
-    assert sensor.attributes.get("unit_of_measurement") == UNIT_OF_MEASUREMENT
+    assert sensor.attributes.get("unit_of_measurement") == TIME_MINUTES
     assert sensor.attributes.get(ATTR_ATTRIBUTION) is None
     assert sensor.attributes.get(ATTR_DURATION) == 30.05
     assert sensor.attributes.get(ATTR_DISTANCE) == 23.903
@@ -381,7 +381,7 @@ async def test_public_transport(hass, requests_mock_credentials_check):
 
     sensor = hass.states.get("sensor.test")
     assert sensor.state == "89"
-    assert sensor.attributes.get("unit_of_measurement") == UNIT_OF_MEASUREMENT
+    assert sensor.attributes.get("unit_of_measurement") == TIME_MINUTES
 
     assert sensor.attributes.get(ATTR_ATTRIBUTION) is None
     assert sensor.attributes.get(ATTR_DURATION) == 89.16666666666667
@@ -431,7 +431,7 @@ async def test_public_transport_time_table(hass, requests_mock_credentials_check
 
     sensor = hass.states.get("sensor.test")
     assert sensor.state == "80"
-    assert sensor.attributes.get("unit_of_measurement") == UNIT_OF_MEASUREMENT
+    assert sensor.attributes.get("unit_of_measurement") == TIME_MINUTES
 
     assert sensor.attributes.get(ATTR_ATTRIBUTION) is None
     assert sensor.attributes.get(ATTR_DURATION) == 79.73333333333333
@@ -481,7 +481,7 @@ async def test_pedestrian(hass, requests_mock_credentials_check):
 
     sensor = hass.states.get("sensor.test")
     assert sensor.state == "211"
-    assert sensor.attributes.get("unit_of_measurement") == UNIT_OF_MEASUREMENT
+    assert sensor.attributes.get("unit_of_measurement") == TIME_MINUTES
 
     assert sensor.attributes.get(ATTR_ATTRIBUTION) is None
     assert sensor.attributes.get(ATTR_DURATION) == 210.51666666666668
@@ -532,7 +532,7 @@ async def test_bicycle(hass, requests_mock_credentials_check):
 
     sensor = hass.states.get("sensor.test")
     assert sensor.state == "55"
-    assert sensor.attributes.get("unit_of_measurement") == UNIT_OF_MEASUREMENT
+    assert sensor.attributes.get("unit_of_measurement") == TIME_MINUTES
 
     assert sensor.attributes.get(ATTR_ATTRIBUTION) is None
     assert sensor.attributes.get(ATTR_DURATION) == 54.86666666666667
diff --git a/tests/components/homematicip_cloud/test_sensor.py b/tests/components/homematicip_cloud/test_sensor.py
index 2ca36e228cc..e3b0f8dd366 100644
--- a/tests/components/homematicip_cloud/test_sensor.py
+++ b/tests/components/homematicip_cloud/test_sensor.py
@@ -20,6 +20,7 @@ from homeassistant.components.homematicip_cloud.sensor import (
     ATTR_TEMPERATURE_OFFSET,
     ATTR_WIND_DIRECTION,
     ATTR_WIND_DIRECTION_VARIATION,
+    TIME_HOURS,
 )
 from homeassistant.components.sensor import DOMAIN as SENSOR_DOMAIN
 from homeassistant.const import ATTR_UNIT_OF_MEASUREMENT, POWER_WATT, TEMP_CELSIUS
@@ -284,7 +285,7 @@ async def test_hmip_windspeed_sensor(hass, default_mock_hap_factory):
     )
 
     assert ha_state.state == "2.6"
-    assert ha_state.attributes[ATTR_UNIT_OF_MEASUREMENT] == "km/h"
+    assert ha_state.attributes[ATTR_UNIT_OF_MEASUREMENT] == f"km/{TIME_HOURS}"
     await async_manipulate_test_data(hass, hmip_device, "windSpeed", 9.4)
     ha_state = hass.states.get(entity_id)
     assert ha_state.state == "9.4"
diff --git a/tests/components/integration/test_sensor.py b/tests/components/integration/test_sensor.py
index c65ca720235..b598d7ddbc2 100644
--- a/tests/components/integration/test_sensor.py
+++ b/tests/components/integration/test_sensor.py
@@ -2,6 +2,7 @@
 from datetime import timedelta
 from unittest.mock import patch
 
+from homeassistant.const import TIME_SECONDS
 from homeassistant.setup import async_setup_component
 import homeassistant.util.dt as dt_util
 
@@ -181,7 +182,7 @@ async def test_suffix(hass):
             "source": "sensor.bytes_per_second",
             "round": 2,
             "unit_prefix": "k",
-            "unit_time": "s",
+            "unit_time": TIME_SECONDS,
         }
     }
 
diff --git a/tests/components/yr/test_sensor.py b/tests/components/yr/test_sensor.py
index 161a7cef66b..8161c8c0faa 100644
--- a/tests/components/yr/test_sensor.py
+++ b/tests/components/yr/test_sensor.py
@@ -3,6 +3,7 @@ from datetime import datetime
 from unittest.mock import patch
 
 from homeassistant.bootstrap import async_setup_component
+from homeassistant.const import TIME_SECONDS
 import homeassistant.util.dt as dt_util
 
 from tests.common import assert_setup_component, load_fixture
@@ -70,7 +71,7 @@ async def test_custom_setup(hass, aioclient_mock):
     assert state.state == "0.0"
 
     state = hass.states.get("sensor.yr_wind_speed")
-    assert state.attributes.get("unit_of_measurement") == "m/s"
+    assert state.attributes.get("unit_of_measurement") == f"m/{TIME_SECONDS}"
     assert state.state == "3.5"
 
 
@@ -116,5 +117,5 @@ async def test_forecast_setup(hass, aioclient_mock):
     assert state.state == "0.0"
 
     state = hass.states.get("sensor.yr_wind_speed")
-    assert state.attributes.get("unit_of_measurement") == "m/s"
+    assert state.attributes.get("unit_of_measurement") == f"m/{TIME_SECONDS}"
     assert state.state == "3.6"