I do most of my riding in the very early morning, year round. My evenings are for family: homework, the kid's activities, dinner. Today I was up at 4, on the bike at 5 for a 40 mile ride (including a coffee stop), shower at the gym and at work by 830, sometimes I can make it a 50 mile ride if I don't stop at the coffee shop. I have friends who have no kids and can't find the time to work out for 30 min/day.
The things I give up are TV and sleep :-)