You could easily spend 4-5 hours viewing animals in environments better than just about any zoo. But let's assume you skip that. You still have Kilamanjaro Safaris, Everest, And Dinosaur as top-level rides that you may want ro repeat, FotLK and Nemo as top level shows, as well as Kali River Rapids, Flights of Wonder, and it's Tough to be a Bug, all of which are very worthwhile for the new visitor. Add Tree of Life viewing, a couple of throwaway rides in Dinoland, a parade (not great, but fun), and you easily fill the 9 hours the park is typically open. But then again, you'd still be missing the animal habitats.
If you're in. Rush, ou can hit three rides and go, but you won't have seen anything close to the whole park.
If you're in. Rush, ou can hit three rides and go, but you won't have seen anything close to the whole park.