I have the same commute distance as FOG, unfortunately the Santa Cruz Hills add a bit of excitement to a commute ride. Anyways if FOG or I got up at 4:30 am left at 5:00am biked at an average speed of 16 mph it would only take a little over 2 hours! Then you have to eat, shower, and work until 5? Change and bike home - you would be home by 7:30 - 8:00 eat dinner and if you are in bed by 8:30 you could get a full eight hours of sleep - we would need it.
Sure, it would completely destroy your days, nights, and bike...but how good would you look in your new biking clothes? Or think about all of the stories you would have of cars and trucks running you over or the time you were flying down a mountain road at 5:30 in the morning and your halogen lights went out. Good times!