Don't these people have jobs?

Owing to the mercifully quiet week at work, my now short commute, and an all-too-rare occurrence of J. actually making dinner, I went cycling after work yesterday. I'm no Lance Armstrong, obviously, but I felt like I pushed it pretty hard -- I am certainly feeling it in my thighs this morning, and I passed more than I was passed. In two hours, after all the traffic lights and transitions between trails were accounted for, I was able to get in around 18 miles (home to just past the East Falls Church Metro and back). I got back around 7:20, just in time for a quick shower and J.'s delicious ochazuke (Japanese salmon and green tea soup). Not a time-maximizing workout. So how do dedicated cyclists put in enough miles in a week to get a consistent workout? If cycling is your primary form of exercise, I reckon you would have to go out at least three times a week, for at least three hours at a time (20-25 miles), preferably longer as your body adjusts to the requirements of your typical ride and begins to maximize its own efficiency. Where do they find the time? I suppose they probably don't cook dinner from fresh ingredients every night, don't read books, and do all their chores on weekends. Come to think of it, that's true of the vast majority of people out there -- at least a handful of them is cycling instead of veging out in front of the television.