1 to 2 hours. It was very busy the day we were there. So it may go faster with less people.
Self guided, I would say 1.5 to 2 hours allows plenty of time to see everything.
Easily two hours minimum if you haven't been there before and plan on looking at most of the exibits plus take pictures.
It's self paced. But about 1 to 2 hour's is about right.
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