Acoording to my experience one day is enough
1 hour is enough you Cant rent a room there
We did it in 5 hours, but we were pretty exhausted. Two days is best it think.
It's a sizable museum. If you take your time a day is enough. Two days if you like to dwell on the thoughtful elements. The room with the waterfall is powerful and I spent a good bit of time to reflect there.
Depending on the crowds, you can finish the tour in one day, but if you take your time you will need two days for sure.
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