A read-only value reporting the time remaining before this router would take over as querier if it stops hearing queries from the current querier, or zero if this router is itself the current querier. This tells an admin how close the local router is to assuming the querier role due to the current querier going silent, useful for anticipating an impending querier failover. A rapidly decreasing igmpInterfaceQuerierExpiryTime would tell the admin the current querier has stopped sending queries and this router is about to take over that role.