You seem to be asking 2 different things. The first is "up and down time" which has to do with when MP's are busy or there is more or less customer flow. The second is about MPA's leaving the business. Slow business at MP's are affected by a lot of factor's. Several MPA's I have talked to have suggested that business is booming during the summer month's and a few have said quite the opposite. For example, during the NHL season, or the day's when the Leafs are usually playing, the MP's are very quite and business is slow. However, I've stopped by MP's after NHL games and there is a sudden rush. So, it's really hard to say if there are any slow period's. Long weekends are also slow times at most MP's I've been to as well as the Christmas holiday's. As for MPA's leaving the business for college/university, there may be a small percentage who may do so, but several MPA's I've visited even manage to work part-time during the school year. Bottomline, there is no concrete answer and guy's will go whenever they're horny.