With a 3 and 4 year old, it was just under 2 hours. It depends on your and their endurance...
I think it depends on you. I take several little ones and have gone twice and spent half a day each and always get stuck in a couple of areas because they are so fascinated by the interactive displays.
You need to plan. A whole day trip if you want to actually absorb and enjoy every exhibit
About 2 hours. More if you take your time at every station.
For adults, I would say about 2 to 3 hours for a relaxed visit.
I would plan on spending 2-3 hours. There are outdoor play areas, so you may want to spend extra time there.
The little ones love to spend lots of time on most of the stations. About 3-4 hrs
I spent two hours with my 12 year old.
I would plan for 2.5-3 hours and they have a little cafe for snack, beverages, and simple foods if you stay longer than that to stay energized.
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