Agree with the others, if the system decides you are AFK after 5 to 10 minutes of inactivity that is too short. If you are marked as AFK after one hour of inactivity, then kicking a player 5 to 10 minutes after this determination is OK. You just need a long enough period of time to allow the system to make an intelligent enough decision as to whether you are inactive or not. Quite honestly if you've been inactive for an hour you're probably not playing actively as it is. If you're sitting idle waiting for friends to log in, you're probably checking back occasionally anyway and doing something that marks you as active once again.