Also depends on how crowded it is.
I was there at opening in early December and rode everything, I saw Bugs Life, took the tour ride, ate, Walked around offering to take pics of people, and snapped hundreds of my own photos and left at 2:30.
I walked right on to Extinction twice and waited a total of ten minutes both times I rode Everest. I could have stayed longer to watch the animal, people watch, or take more pics just to kill the rest of the day but I wanted to beat the I-4/Tampa traffic.