At least 80 hours for me.
I wake up for work around 5:15am, leave the house by 6:30am and start work at 7:45am. I always take a 25 minute cat-nap on the Metro when on my way to work. I usually don't leave work until 5:15pm, sometimes later if something critical is going on. However, most nights I am home around 6:30pm, at least for a little while until some nights, I head out again to run around or drive or pick up the kids from after school activities. Of course in between all this, I am constantly on the PF. Most nights, I do not even go to bed until around 11:30pm, and usually watch TV for awhile before falling asleep. It seems like I am always on the go. It was even worse when I was doing all this, and trying to finish up my Masters, but somehow I am used to my schedule.
I love the weekends when I can sleep-in, and do some catching up.