This read-write value, from 1 to 65535 seconds, sets how often the switch, acting as IGMP querier, sends General Query messages to detect which hosts are still subscribed to multicast groups. An admin shortens this interval to detect hosts that have quietly stopped watching a multicast stream more quickly, at the cost of slightly more query traffic. For example, shortening the interval to 60 seconds detects a set-top box that dropped off an IPTV channel faster than the longer default interval would.