That would be a tough commute for anyone, let alone someone who hasn't biked for 20 years. My commute is 31 miles/day round trip, which takes me about 2 hours, but I have been cycling regularly for years. That doesn't mean you couldn't do it, but it would take a bit of will-power, stubbornness and commitment to make it work. You would also need to ease yourself back into shape or would likely suffer injuries or discouragement. My advice would be to try to break up the commute by driving or taking transit for part of the route, if possible. Or you could drive to work with your bike on a rack, ride it home, ride back to work the next day, drive home, etc. That way you starting with more manageable distances while you get back into shape.