From looking at the pictures the building doesn't look that big. So is it a 25-45 minute tour of observing? Because other museums almost took half day.

they tell you at the reception average 55 min. Well worth it no photos

It takes about an hour, hour and a half

Takes about an hour or so

Youre correct. It isn't very big; however; it's a lot of reading and there are so many things to see inside. It took about an hour to an hour and a half for me to check everything out. You go through a series of rooms and it's not very big at all.

It takes about an hour