How long should it take for the Inactivity Timeout to work? The Inactivity Timeout feature relies on the Automatic Check (WDC_Periodic_Check) process to execute on a regular basis. It is this check which will decide if it is time to attempt to exit once the inactivity period has expired. So the time to exit will be between the Inactivity Timeout setting and the Inactivity Timeout setting plus the Automatic Check period. It will be the first Automatic Check that executes after the Inactivity Timeout period is over.