You might be okay! I used to work at BBB and they taught us to do each princess's makeover in about 30 minutes, and it helps that it's an early morning reservation. The only reason I can think of that would make it last longer is if your princess has really difficult/super long hair. It helps SO much if her hair is brushed and as free of tangles as possible! You might tell the hostess that you have reservations at CRT so they can do what they can to be as efficient as possible. If it were me, I would also try to arrive early to BBB just because SO many things seem to happen along the way when you are hurrying to get somewhere at Disney. Have so much fun!!