Without kids, maybe an hour. But there are a couple slides the kids can go on and they seem to be the ones that can explore all the little crevices so plan 2-3 hours if you got kids.
However long you want. You can stay all day if you want.
You can easily spend quite some time. We went last year, and with two kids and a couple of family members we probably stayed for 2 hours or so. You could easily spend leas time, but that was our experience.
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