gfdev: fixes unparseable for duration

devenv/dev-dashboards/testdata_alerts.json

@@ -563,7 +563,7 @@
           }
         ],
         "executionErrorState": "alerting",
-        "for": "9000000h",
+        "for": "900000h",
         "frequency": "1m",
         "handler": 1,
         "name": "Always Pending",