I would put it around three hours. But will also depend on how much time you spend on some specific exhibits.
you can take as long as you want x somethings may interest you and some may not x
We did it in about 2 hours with no crowds at all.
2-3 hours depending on your love for all things animal. There are quite a few things to do. Depends on if there are any large groups there.
Around 3 hours...
During Thanksgiving midweek around 3 hours max.
2 to 3 hours
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