I called them and they stop selling tickets and letting people in at 6:00pm it takes about an hour and a half too see all the exhibits and about 15 minutes to see any one exhibit
6pm is closing though so you'll want to give yourself at least 2 hours. We were there for 3 last time and still didn't quite see it all
The latest I would suggest going is at 5 to see it all. You will be rushed though..
Hi I don't remember, but I'm sure you can find more information online
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