On Fridays and Saturdays the galleries are cleared at 8:45 PM and they stop letting people into the museum at that time. They try to have the visitors out of the building by 9 PM.
Thursday 10AM–5:30PM Friday 10AM–9PM Saturday 10AM–9PM Sunday 10AM–5:30PM Monday 10AM–5:30PM Tuesday 10AM–5:30PM Wednesday 10AM–5:30PM
It has longer hours on Friday and Saturday. I believe it closes at 9:45pm on those days.
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