The maximum query response time in seconds advertised in IGMP v2 queries on this VLAN if the switch is the querier. Smaller values allow a switch to prune groups faster. So it is the maximum response time inserted into the general periodic queries. This variable enables the tuning of the burstiness of the IGMP traffic. If it is increased the responses have a larger time span in which to be generated by the hosts. It is set stack-wide. The default is 10 seconds and the range is 10 to 100 seconds. There could be 2 settings apart from the default. Slow Response (50 secs) and Very Slow Response (100 secs).