"The room, the hours that we worked were incredible. I don't think anyone ever worked anything less than 10 to 12 hours each day. Saturday was a normal day of work; in fact, that's the way we felt it should be. We were given this impossible dream by President Kennedy, and we were living it. We were doing the kinds of things that engineers would kill for. And as part of this process, we'd go and open up our pay—we were surprised we were getting paid by this thing here. As long as we had enough money to make things meet, that's all we needed. The job was our life, and we lived this literally every day."
Gene Kranz is an interesting case here. He had a loving and very supporting wife who would make him new vests for every mission, which became symbolic for the team he worked with.
10 - 12 hours a day is pretty typical in the entertainment business. Most tv shows do 12s for an entire year, movies about the same for less, and VFX workers during crunch time (which is near permanent for some) 12 is usually the minimum. Plus your weekends are gone.
At least the guys in the Space Program were doing for a far more valuable reason.
- NASA Flight Controller Gene Kranz
http://www.pbs.org/wgbh/nova/tothemoon/kranz.html