diff --git a/config.json b/config.json
index df8b229..d103ab2 100644
--- a/config.json
+++ b/config.json
@@ -22,7 +22,8 @@
             "mongo": {
                 "url": "mongodb://192.168.68.53:27017/farmcontrol"
             }
-        }
+        },
+        "otpExpiryMins": 0.5
     },
     "production": {
         "server": {