Depends on you. If you are a thorough observer, it may take you 4/5 hours. However, 1.5 to 2 hours will be enough if you are not.
Id allow at least 2 hours.
As long as you want it to, you can spend as long as you like at each exhibit.
You could easily spend a couple of hours here. Each exhibit has a great story
I spent an hour and a half to go from the beginning to the start of WWI. I am looking forward to going back and finish the timeline. It's great that you can see it that way or pick and choose points of interest.
You could easily spend a couple of hours, but the exhibits are in sections/groups if you wanted to do it quicker
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