It causes problems when doing upgrades or time changes when a user does not log out of Atrium overnight.  To avoid this we are now forcing the user to either be active or to automatically be logged out after 30 minutes of inactivity.  One minute prior to being logged out, they will receive a pop up message that lookssimial to this:

If the user clicks OK, then logout will not occur.  Otherwise the user will be logged out of Atrium in about 1 minute.