This read-write integer, applicable only to web-based 802.1X authentication, sets how many seconds an already-authorized client may go without sending traffic before the switch demotes it back to unauthorized. An administrator tunes this to automatically reclaim a port's access when a previously logged-in device has gone idle or disconnected without a clean logoff. For example, setting this OID to 600 means a web-authenticated laptop that's been powered off for ten minutes will have its authorized state revoked automatically.