I can tell you you'll want a day for the main hangar (if you hurry)...
I was there 15-16 years ago - Gotta say it was one of the most disappointing things I'd planned..
Disappointing, in the fact, that after travelling from Australia, I'd allowed one day for this visit.
One singular day...
I saw about three quarters of one hanger, rushed the last quarter, and walked out dis-believing there were another two hangers that I'd missed ?
It was so disappointed, knowing I didn't have the time, and might not be back anytime soon.
I had never seen anything done on such a large scale before.
Oh, and the president was having a dinner there. If you see him, say hi for me.
(Can i claim that I only really missed one hanger, as the other was out of bounds from memory)
No idea about how much time you'll need for the other two (three) hangers..
One of the (rushed) highlights of my life, Shame all photo's were stolen in Chicago
A repeat is on the bucket list