This command sets how many days a room must go without services opping anyone before it expires.
/as services set chanexpire 30
Expiration is important because it frees up rooms that are no longer being used or properly managed for others to take over and run. This is especially important if room registration is open to all users. Many users will register rooms and then forget about or abandon them. Short expiry times make it easier for new users to find good room names. However, too low an expiry time will cause people's rooms to expire too easily. Even well managed rooms may have quiet times, especially if most of the users are students and have vacations at the same time.