It's an at-your-leisure experience. You can be through in 10 minutes, or you could be there for an hour or two. There are probably 20-ish exhibits, plus a park.
Depends on your pace and what you want to see. The arnmals are in an environment that mimics their natural habitat so the zoo space is widely spaced. It can take a good 2 hours if want or 30 minutes if you rush through. Take one of the courtesy wagons if you have kids or toddlers.
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