On the mobile app for iPhone and Android, you can set up a custom reminder to send you an alert on your phone when a running timer has exceeded a certain length of time. You can set this reminder up by following these steps:

1. Go to the Account tab and tap on Notifications.
2. Toggle on the Timer reminder.
   • Note: In order to receive the reminder on your phone, you will need to turn on notifications for the Harvest app in your phone's settings.
3. Tap on Remind me after and choose the amount of time you want to track before a reminder is sent.

The length of time before the reminder is triggered can be changed whenever you want. You can toggle off the reminder whenever you would like as well.