All day (at least 4 hours minimum) IF you want to experience everything they have there.
At least 3-3.5 hours, especially if you have kids
Depends on how energetic your group is. I'd say minimum 2.5 - 3 hours. But can easily spend the entire day.
Good half day at least
The whole day is the best
You can easily spend the whole day there. Or all day at the treehouses...
You cant complete the whole thing in one trip. It usually takes us an hour or two to get through the inside and several hoursto do the outside
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