30 to 45 minutes.
It really depends on how much you want to really watch every thing. You could walk the whole park in about 30 minutes, but that's because how well grouped, spaced, and pathed all the exhibits are. There are also a good number of benches if you want to take your time seeing the animals or feed them.
Depending on how long you spend on each animal, or look at the store, picnic etc. It could take a couple of hours. Enjoy
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