Are you talking about the one at DL and not the big production at DCA? The DL show is at Alladin's Oasis between the Tiki Room and the Jungle Cruise. There is a schedule out front, but I know lst week it was at 11:45, 12:45... I'm not sure exactly how many shows there were. The nice thing is there is a meet and greet afterwards for pictures and autographs. We caught the show on our final day at the park which made my daughters trip, since she was able to get Jasmine's (her favorite princess) autograph and picture.
The Alladdin show at DCA is a big production that is supposed to be wonderful. It is held at the Hyperion theater. Basically once you go in the DCA gates, take a left through the Hollywood back lots and it will be at the very end (if you take a right at the theater you will end up at the Tower of terror) It runs Wed-Sunday. I can't remember all the times, but I know the first is at 12:35. Unfortunately for us, we missed this show (again...) The only days we would've had time were Monday and Tuesday and those are the off days. One of these days we'll catch the show!