This read-only timer value indicates the remaining time before a multicast routing entry will be automatically aged out and deleted, measured in TimeTicks (hundredths of a second); a value of 0 means the entry is not subject to aging and will persist indefinitely. Multicast routing entries can be statically configured (which don't age) or dynamically created by the routing protocol, and this timer helps the router clean up obsolete routes. Network administrators use this to understand multicast route stability and verify that static routes (with value 0) are properly configured.