diff --git a/supervisor/const.py b/supervisor/const.py
index 922ef8742..49c8d6b1b 100644
--- a/supervisor/const.py
+++ b/supervisor/const.py
@@ -32,6 +32,17 @@ DOCKER_NETWORK = "hassio"
 DOCKER_NETWORK_MASK = ip_network("172.30.32.0/23")
 DOCKER_NETWORK_RANGE = ip_network("172.30.33.0/24")
 
+# This needs to match the dockerd --cpu-rt-runtime= argument.
+DOCKER_CPU_RUNTIME_TOTAL = 950_000
+
+# The rt runtimes are guarantees, hence we cannot allocate more
+# time than available! Support up to 5 containers with equal time
+# allocated.
+# Note that the time is multiplied by CPU count. This means that
+# a single container can schedule up to 950/5*4 = 760ms in RT priority
+# on a quad core system.
+DOCKER_CPU_RUNTIME_ALLOCATION = int(DOCKER_CPU_RUNTIME_TOTAL / 5)
+
 DNS_SUFFIX = "local.hass.io"
 
 LABEL_ARCH = "io.hass.arch"
diff --git a/supervisor/docker/addon.py b/supervisor/docker/addon.py
index 4f33fee59..bae599cc4 100644
--- a/supervisor/docker/addon.py
+++ b/supervisor/docker/addon.py
@@ -14,6 +14,7 @@ import requests
 
 from ..addons.build import AddonBuild
 from ..const import (
+    DOCKER_CPU_RUNTIME_ALLOCATION,
     ENV_TIME,
     ENV_TOKEN,
     ENV_TOKEN_HASSIO,
@@ -285,7 +286,7 @@ class DockerAddon(DockerInterface):
 
         # If need CPU RT
         if self.addon.with_realtime:
-            return 950000
+            return DOCKER_CPU_RUNTIME_ALLOCATION
         return None
 
     @property
diff --git a/supervisor/docker/audio.py b/supervisor/docker/audio.py
index a7e5198ee..14388eeb2 100644
--- a/supervisor/docker/audio.py
+++ b/supervisor/docker/audio.py
@@ -4,7 +4,7 @@ from typing import Dict, List, Optional
 
 import docker
 
-from ..const import ENV_TIME, MACHINE_ID
+from ..const import DOCKER_CPU_RUNTIME_ALLOCATION, ENV_TIME, MACHINE_ID
 from ..coresys import CoreSysAttributes
 from ..docker.const import Capabilities
 from ..hardware.const import PolicyGroup
@@ -67,7 +67,7 @@ class DockerAudio(DockerInterface, CoreSysAttributes):
         """Limit CPU real-time runtime in microseconds."""
         if not self.sys_docker.info.support_cpu_realtime:
             return None
-        return 950000
+        return DOCKER_CPU_RUNTIME_ALLOCATION
 
     def _run(self) -> None:
         """Run Docker image.