Use the Edit Group command and select Hunt Time-Out. From here you will get a rich card with available options.

Total Hunt Time-Out (in seconds) – The maximum amount of time the hunting process can last. After this period has expired, website visitors will receive a message that there are no agents available and if they would like to leave a message (if enabled).
Agent Hunt Time-Out (in seconds) – The maximum amount of time an agent is hunted before switching to another agent. If you have multiple agents within a group, you can decide how long the hunting process will last per agent. After this period has expired, uWebChat will forward the chat request to the next agent in the group.