How was your experience?
We were there 4 hours until closing. After 3 hours we thought we were near the end and the guard told us we had another floor to do so we had to rush through at the end. To see, read, watch and interact with all of the exhibits would probably take 5 hours for adults. A school group arrived but they were in and out in less than 2 hours. Children (or adults who act like children) will not have the interest or patience to read all of the explanatory material. We found it fascinating.