2 hours - 5 hours. There is a lot there so depends on your taste, if you read everything you could be there for a whole day.
Half a day would be good. There are a lot exhibitions on many floors.
Depending on your taste, 2 to 4 hours
Two to four hours is good. Four if you enjoy sitting down and watching the video presentations, which are quite well done.
two hours
I spent 2 hours and was enough for me.
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