About 3-4 hrs with my 3yr old. Usually only doing 1 ride, and we get there within an hour of the zoo opening.
About 4-5 hours if you ride the train, sky ride, and boat. It wasn't very busy and lines were short. Weekday during summer hours.
My family and I normally make it through in about three hours taking pictures stopping for dirnks and riding the carousel.
4 to 5 hours if you take your time to take pictures do the rides have a strategy to what to do first maybe less time than I mentioned
Thanks! Your answer is awaiting moderation.