SMC Networks TIGERSWITCH 10/100 - Manual (Page 206)

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query-count, but a client has not responded, a countdown
timer is started using an initial value set by this command. If the
countdown finishes, and the client still has not responded, then
that client is considered to have left the multicast group.
Example
The following shows how to configure the maximum response
time to 20 seconds:
Related Commands
ip igmp snooping version (3-65)
ip igmp snooping router-port-expire-time
Use this command to configure the snooping query timeout. Use
the no form of this command to restore the default.
Syntax
ip igmp snooping router-port-expire-time seconds
no ip igmp snooping router-port-expire-time
seconds - The time the switch waits after the previous
querier stops before it considers the router port (i.e., the
interface which had been receiving query packets) to have
expired.
(Range: 300-500)
Default Setting
300 seconds
Command Mode
Global Configuration
Console(config)#ip igmp snooping query-max-response-time 20
Console(config)#