The soundtrack for the ride is just short of 5 minutes.

The ride holds about 87 people per screen and there are two screens at WDW. If you allow a total of 6 minutes per ride which includes the load/uload procedures and then the ride, that's 870 people per hour per screen or a total of 1740 per hour, barring any technical difficulties or other interruptions. These are all assumptions, but I'm betting they are pretty close.