I was in for 2 hours
They say 60min or a little longer. We were let in with a lot of other people attending. It was hard to see the artwork and read about it as well. Then we had to stand in line for 45min to be let in to the immersive experience. You can stay in there as long as you want. I hope this helps some, I've heard other people had other experiences.
1 hour if you read everything and stay for last 30 minutes.
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