Remember, 4 of those hours of commuting are sitting on a train. You can watch movies, read books, take a nap, play games, get work done, etc.

I usually was at work from 10-5 and usually sleep closer to 6 hours a night. That gave me about 6.5 hours of free time. I also worked from home twice a week.

I personally hated it and only lasted at the job for a little over a year, but I could understand how some people could make it work.