Online Help | Desktop App
Customizing settings for push notifications
Under Notifications > Push Notifications > Settings section of the the 
To change the default timeout period:
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Under Push Notification Server, specify an interval in seconds in the Connection Timeout field. 
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Click Save on the Standard toolbar to save your changes. 
NOTE: Push notifications also use the global settings specified for both e-mail and push notifications. If you need to customize the default global settings, go to Notifications > Global Settings. For details, see Setting up outgoing e-mail notifications.