it is up to the individual,you can stay as long as you want. i've been twice, and take one & a half to two hours.
We were there for 3-4 hours. We did all of the (free) scavenger hunts and just had so much fun slowing down and really taking in all of the exhibits and spending time studying them. It's really a fascinating place!
I will say this - if you breeze through in less than 30 minutes, you're really doing yourself a disservice and might as well not go.
I'd recommend - at a minimum - 1-2 hours if you're even remotely interested in the subject. :) Enjoy!
I was there for an hour, at most. It's very small. Unless you do a scavenger hunt, you could easily walk in and out in 15 minutes.
At least an hour, no more than 1.5 unless there's an event happening. It's compact.
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