The Last Member Query Interval is the Max Query Response
Interval inserted into group-specific queries sent in
response to leave group messages, and is also the amount
of time between group-specific query messages. This value
may be tuned to modify the leave latency of the network. A
reduced value results in reduced time to detect the loss of
the last member of a group. The value of this object is
irrelevant if mgmdRouterInterfaceVersion is 1.