diff --git a/src/alerting.py b/src/alerting.py
index f33360e..0df1622 100644
--- a/src/alerting.py
+++ b/src/alerting.py
@@ -282,7 +282,7 @@ class WaterLevelAlertSystem:
 
         return alerts
 
-    def check_data_freshness(self, max_age_hours: int = 4) -> List[WaterAlert]:
+    def check_data_freshness(self, max_age_hours: int = 12) -> List[WaterAlert]:
         """Check if data is fresh enough"""
         alerts = []