It seems to me you never have enough time at conventions to do all the gaming you want to do. Or, more accurately, you schedule more gaming than you can enjoy. This is what happened at NTRPG Con for my wife and I - the days we had two games on the schedule were literally overwhelming and exhausting. In my mid 40's I no longer have the stamina I had in my mid 20's.
Oh, and don't forget needed to leave time for pick-up games.
I figure in the future we'll limit ourselves to one scheduled game each day.
So, how much gaming do you try to squeeze in at conventions?