If a host on the LAN leaves a group it sends an IGMP leave message (assuming PIM version 2). Upon receipt the elected IGMP querier will send out an IGMP last member group query to ascertain if there are still other hosts on the LAN segment who are members of the group. If no hosts reply, after the message has been repeated, then the IGMP querier router removes the (*,G) mroute.
The timers/counters involved in this exchange are
ip igmp last-member-query-count (default 2)
ip igmp last-member-query-interval (default 1000ms)
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