@@ -218,7 +218,8 @@ def flaky(path: str, *args: object, **kwargs: object) -> object:
 
     mocker.patch(f"filelock._lease.{target}", side_effect=flaky)
     seen: list[LeaseCompromise] = []
-    lease = _lease(marker, on_compromise=seen.append)
+    # A long lease keeps a slow runner's two failed ticks inside the window; the deadline has its own test above.
+    lease = _lease(marker, lease_duration=30, on_compromise=seen.append)
     with lease:
         time.sleep(_HEARTBEAT * 6)  # several ticks: the first two fail, the rest recover
         assert seen == []
 
@@ -496,11 +496,11 @@ def test_strict_soft_reaper_does_not_retry_sharing_error(tmp_path: Path, mocker:
         side_effect=PermissionError(EACCES, "sharing violation"),
     )
 
-    started = time.perf_counter()
+    sleep = mocker.patch("filelock._strict.time.sleep")
+
     assert StrictSoftFileLock(lock_path).claims == ()
-    elapsed = time.perf_counter() - started
     reaper_unlinks = [call.args[0] for call in unlink.call_args_list].count(private_path)
-    assert (reaper_unlinks, elapsed < 0.1, private_path.exists()) == (1, True, True)
+    assert (reaper_unlinks, sleep.call_count, private_path.exists()) == (1, 0, True)
 
 
 @pytest.mark.parametrize("record", ["claim", "sentinel"])