About 4 hours if you haven't been there before to be able to find your way around
To see everything the zoo has to offer I would say 3 hours for a speedy walk through. If you want a great experience and enjoy the exhibits, feed the giraffe or rhinos, watch the educational birds of prey snow and also see the whole park I would reserve a full day and get there early. Check the website for events and get the year pass to support our local zoo at a great rate.
I agree with Aleja'ndro
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