EDIT for those who say it is too far, well everyone has a different threshold. My commute is only 2 miles, but I often take the 40 mile "shortcut" on the way home. I ride early mornings too, 50-80 miles 3 days a week and am home before the kids go to school. Yeah I have been doing this for years, but it is certainly doable, just depends on your level of commitment (or whether you should be "committed.")
zac
I think the consensus is that it's a little far to do every day. Many people have suggested alternate days or other solutions. I'd also say that there's big difference between riding 30 or 40 miles to work and a 30 - 40 mile rec/training/group ride unless you have a pretty stellar route to work.