One thing that I love about my bike commute is that it takes 50 minutes by car, in good traffic...up to 90 minutes if traffic is bad. When I ride by bike, it's always 65 - 70 minutes. I might lose 30 minutes of my day, but the 2.5 hours of total fitness more than makes up for it, not to mention the boredom of sitting in a car idling on the highway...which has obvious environmental impacts.