Using Task Timers
Task nodes can include task timers to trigger an action after a specified time period. Timers are useful for ensuring a task does not go unattended for too long. Available timer actions include sending an additional notification, reassigning the asset, or creating a timer action.

You can modify the out-of-the-box Single Approver workflow definition to use a timer in its Review task:
- 
Open Global menu (  ) → Applications → Process Builder. ) → Applications → Process Builder.
- 
Click Single Approver in the workflow definitions list. 
- 
Click the Review task node. 
- 
Click New from the Task Timers section of the configuration sidebar. 
- 
Fill out the new timer form: - Name: Review Timer
- Duration: 3 days
- Recurrence: Enabled
- Duration: 24 hours
- Type: Notification
- Name Review Reminder
- Template Language: FreeMarker
- Template: Bump! $ sent you a $ for review in the workflow.
- Notification Types: Email and User Notification
- Recipient Type: Task Assignees
  
- 
Click Update. 
When a review task is idle for three days, the timer now reminds task assignees to complete their reviews. The reminder notification repeats daily.