# Set up session timeout events

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Supported on **WhatsApp** and **SMS**.
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The **Session Timeout Event** sends a courtesy notification to end-users when their session is about to expire. 

The default **channel session length** is 10 minutes. This means the session will automatically end if there's no activity (i.e., no inbound messages from the end-user) within this timeframe. Whenever the end-user sends a message, the session timer resets and the countdown starts again.

You can configure the system to send a final “goodbye” message to the end-user at a specified time before the session expires, keeping them informed and engaged.

## Set up session timeout events

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Session Timeout Event configuration functions independently in the **Sandbox** and **Production** environments. This allows the flow-builder to activate the feature in Sandbox for testing proposes while it's deactivated in Production, or vice versa.   
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1. Under *Configuration* on the left, select *Settings*.  
2. Select *Timeout Event.*
3. Use the toggle to enable/disable the timeout event. 
   * When enabled, the timeout event flow is triggered at the desired time (e.g., 70 seconds before session expiration). 
   * When disabled, no message will be sent before session expiration.
4. Select the duration from the drop-down.
   * This is how long before the channel session expires you want to trigger the timeout event flow.
5. Click *Open Flow* to open and customize the pre-built placeholder timeout.
   * This flow triggers automatically when the timeout duration (as set above) is reached.

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