diff --git a/main.py b/main.py
index 0d2e0eb..dbb3752 100644
--- a/main.py
+++ b/main.py
@@ -18,8 +18,6 @@ NUM_THREAD = 16
 MAX_RETRY = 3
 RETRY_TIMEOUT = 30 # In seconds
 
-current_time = int(time.time())
-
 def safe_print(*args, **kwargs):
     # When run with 'chronic' and 'timeout', stdout gets suppressed
     # due to buffering. Make sure to always flush the output.
@@ -27,6 +25,7 @@ def safe_print(*args, **kwargs):
 
 # Return None if no error occurs and a string for error message otherwise
 def check_project(args) -> Optional[str]:
+    current_time = int(time.time())
     project, data = args
     try:
         project_class = getattr(sys.modules[__name__], project)
@@ -43,8 +42,9 @@ def check_project(args) -> Optional[str]:
 
         elif (data[project]["out_of_sync_since"] is not None
                 and current_time - data[project]["out_of_sync_since"] > data[project]["out_of_sync_interval"]):
-            time_str = strftime("%d %b %Y %H:%M:%S (local time)", localtime())
-            return f"{project} out-of-sync at {time_str}"
+            now_str = strftime("%d %b %Y %H:%M:%S (local time)", localtime())
+            duration = current_time - data[project]["out_of_sync_since"]
+            return f"{project} out-of-sync at {now_str} for {duration}s"
 
         else:
             data[project]["out_of_sync_since"] = current_time