diff --git a/cron/TripsWorker.js b/cron/TripsWorker.js
index 86d0b52..b2b7759 100644
--- a/cron/TripsWorker.js
+++ b/cron/TripsWorker.js
@@ -10,7 +10,7 @@ const TIMEFIX = 25200
 cron.schedule("0 0 * * * *", job)
 
 // cron every 5 minutes
-cron.schedule("*/10 * * * *", tripGrouping)
+cron.schedule("*/30 * * * *", tripGrouping);
 // job()
 // tripGrouping()