Damn, that's quite the commute. Mine is less than two miles there and back, but I also ride pretty much everywhere I need to go (major city + no car). Even then, the absolute most I go in one direction (every other Saturday morning, to a farmers market) is about 15 miles.
On the other side of the coin, it is only two times a week (which I didn't catch the first time I read it through). Your best bet is to start riding that commute now (or one of similar distance) twice a week to see if you can realistically do it on a regular basis.