diff --git a/radicale/tests/test_base.py b/radicale/tests/test_base.py
index 1c934f6a..3d80a259 100644
--- a/radicale/tests/test_base.py
+++ b/radicale/tests/test_base.py
@@ -874,7 +874,7 @@ permissions: RrWw""")
         delay = .3
         delay_min = delay * 0.9  # no random jitter during test
         delay_max = delay + 0.2  # no random jitter during test
-        if sys.platform == "darwin":  # no reliable sleep times
+        if sys.platform == "darwin" or sys.platform == "win32":  # no reliable sleep times
             delay_max = delay_max * 1.5
 
         self.configure({"server": {"delay_on_error": delay}})
@@ -910,7 +910,7 @@ permissions: RrWw""")
         delay = .3
         delay_min = delay * 0.9  # no random jitter during test
         delay_max = delay + 0.2  # no random jitter during test
-        if sys.platform == "darwin":  # no reliable sleep times
+        if sys.platform == "darwin" or sys.platform == "win32":  # no reliable sleep times
             delay_max = delay_max * 1.5
 
         self.configure({"rights": {"permit_delete_collection": False}, "auth": {"delay": delay}})
diff --git a/radicale/tests/test_sharing.py b/radicale/tests/test_sharing.py
index f7b93313..78601aa4 100644
--- a/radicale/tests/test_sharing.py
+++ b/radicale/tests/test_sharing.py
@@ -266,7 +266,7 @@ class TestSharingApiSanity(BaseTest):
         delay = .3
         delay_min = delay * 0.9  # no random jitter during test
         delay_max = delay + 0.2  # no random jitter during test
-        if sys.platform == "darwin":  # no reliable sleep times
+        if sys.platform == "darwin" or sys.platform == "win32":  # no reliable sleep times
             delay_max = delay_max * 1.5
 
         for path in ["/.sharing", "/.sharing/"]:
@@ -930,7 +930,7 @@ class TestSharingApiSanity(BaseTest):
         delay = .3
         delay_min = delay * 0.9  # no random jitter during test
         delay_max = delay + 0.2  # no random jitter during test
-        if sys.platform == "darwin":  # no reliable sleep times
+        if sys.platform == "darwin" or sys.platform == "win32":  # no reliable sleep times
             delay_max = delay_max * 1.5
 
         self.configure({"auth": {"type": "htpasswd",