How long should we allow ourselves to visit the museum?

5 or 6 hours to see everything

If you really want to absorb the incredible history, allow 4.5 hours. I have done it in 2.5 with our little grandsons.

Depends how quick you are, and if you go inside or not. I spent almost 3 hours there just outside, but we were moving slowly

Most museums hold my attention for 2-3 hours; I would reccomend 3-5 for the indoor exhibits and more if you want to check out the outdoor exhibits. It is an amazing museum!