Don't do it! It'll mess with your sanity within a month or so.
I used to do 35 motorway miles each way to work and that took 45 minutes on a quiet day, but typically just over an hour. I would get into work stressed, get grief off management for being in late, and it just generally made you more tired than necessary.
I moved closer in the end and then got made redundant 6 months later!
Andy