On the 3rd floor there is also a great interactive mini movie that lets the audience vote (by pushing buttons by their seat) on what city in Texas they would like to learn about. This was especially entertaining for the children. They also have IMAX films, but we didn’t see any of those.
We went in the afternoon and had the majority of the place to ourselves which was great! The exhibits are on 3 floors. We spent a little over an hour at the museum. I would allow for 2-2 1/2 hours if you were going to watch all of the mini films. I believe there are 5.
Download the Visitors Guide for more info.