We spent ALL day there..but that being said we were with a group of Cub Scouts, some a little slower than others. It's a free National Park with the exception of the train ride. You could spend a little as a few hours if you hustle through. It is a great place to see!
It's until 5pm. Take as much or as little time as you want. Enjoy as much as you can
Can get a good flavor of it in an hour or two, but it would be easy to spend all day. It's free, so I would definitely go, just to see what's there.
I dont know there hours sorry
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