You can make a whole day of it, if you've never been there before, or if you want to redo attractions you like. The first time I went there, though, we finished in less than a day, but we skipped several things. I have never stayed from 9 AM through an EMH evening--but basically, all the animal exhibits and Kilimanjaro Safaris are closed or not viewable after dark. There are still shows, rides, etc. to do, though.