We were there at open and were able to get through to lunch, but we had little legs with us and hit the amphibian exhibit.
we were there from 1-4ish - including stopping to eat lunch. depends on how much you want to stop and observe (we skipped amphibian exhibit) but definitely not all day.
That depends on how many animals are out for you to view and how long you watch them
Should only take 3 to 4 hours.
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