A read-create value, in tenths of a second and defaulting to 10 (1 second), setting both the response time advertised in and the interval between Group-Specific Queries sent after a Leave Group message, and irrelevant when igmpInterfaceVersion is set to 1. This directly tunes how quickly the router confirms whether any other members remain in a group after receiving a leave message, so lowering it speeds up multicast leave/prune processing at the cost of more query traffic. An admin running IGMPv2 or v3 who wants faster channel-change response for IPTV subscribers might lower this value to shrink the delay between a leave message and the router confirming no members remain.