What is Chessmaster? Is it one of the engines? Can you use it quickly? If you can't then we should do real time. I'm not the greatest of players, but I'd like either multi-day games or 5 min ones.
5 min could be a good thinking time, though I personally like 15-20 min time. 5 min has the advantage that it's too little to use a chess computer program.
Yes, I tend to play 3-5 minute games (blitz). This may be to do with the fact that as I'm not the greatest of players, better players have the advantage of strategic thinking reduced by time pressure.