Closing Interface without user interaction

Can i know reason behind the requirement ?? Are you trying to show a banner message or something else??. It Can be done by configuring a exception on task but i don't suggest it

Hello [mention:86aa8df1972a47389e479372e8e43a08:e9ed411860ed4f2ba0265705b8793d05] 

We cannot close the interface automatically(User will have to either refresh the browser or reload). But the process can go ahead without any user activity on the screen(Or can be terminated). You can make use of the exception timer and configure this.

 https://docs.appian.com/suite/help/24.4/Process_Node_and_Smart_Service_Properties.html#exceptions-tab