The time limit issue was exclusive to IYT. The main reason for changing time limits was to avoid time out when an emergency arrived. For example there are situations in many games where i would move 5-6 times a day then take as many as 6 days for one move. With most fischer clock settings i will have timed out after going 6 days without moving. To optimize peak performance you cannot restrict time limits on moves. so our time limits would go from 3 days ( standard) to 7 days for emergencies. then we would change it back when the week ended or your leave was over!