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When you issue an invitation asking for Remote Assistance in Windows 8, it stays valid for a long time (six hours). Is there a way to make the invitation valid for a shorter period of time? Thanks.
Pull up the control panel and select System and Security>Allow Remote Access>Advanced. Select the desired amount of time for the invitation to remain open in the invitations box and click "OK" 2x. It’s simple once you know where to change it.