I don't know about all of you...but for me even 1 hour of exercise a day is a high time commitment, especially when you have to look at the overhead (drive to gym, get clothes, change clothes, drive back)...it can easily turn into 2 hours a day
These folks are going to drive to the gym and then run on a treadmill facing a brick wall?
Secondly, my routine emphasizes weight training over aerobics, and I prefer to retain my energy for the weights and jog afterwards. Jogging to the gym does not fit my exercise routine.
I'll admit, it's been difficult and can seem like a chore, but going with someone else is a real motivator - you don't want to let the other person down. In addition to a higher level of fitness, I always leave the gym feeling energized and happy.
As with everything else, such as sleep and nutrition, you give it the time you think it deserves. If you put your health behind other priorities, no complaining when your body gives out before its time.
And finally, everybody and every body is different. I've found that a one hour weight training session three times a week is enough to maintain my current muscle mass (which I've earned the six years prior to switching to a maintenance workout). You might find that you need less than an hour a day once you get your body in shape.