diff --git a/support/testing/infra/emulator.py b/support/testing/infra/emulator.py
index 0f925fc9fb..a39d59b881 100644
--- a/support/testing/infra/emulator.py
+++ b/support/testing/infra/emulator.py
@@ -72,8 +72,10 @@ class Emulator(object):
     # Wait for the login prompt to appear, and then login as root with
     # the provided password, or no password if not specified.
     def login(self, password=None):
+        # The login prompt can take some time to appear when running multiple
+        # instances in parallel, so set the timeout to a large value
         index = self.qemu.expect(["buildroot login:", pexpect.TIMEOUT],
-                                 timeout=10)
+                                 timeout=60)
         if index != 0:
             self.logfile.write("==> System does not boot")
             raise SystemError("System does not boot")