I was really impressed with all of the shows, they all seemed to start at exactly the moment they were scheduled. Our only exception was the Frozen fireworks which started at 9:45, I read afterwards that people assume that is because they want to let the first F! out before starting and come to find out there was a problem during the first F! where they stopped the show. My friend was at the first show and left when they had the delay (she thought maybe a performer got hurt) she left so not sure how long it was delayed.