I actually have a 48km one-way commute and it is do-able. This morning it took 1:45 total and this evening 1:35 total, with a headwind and rain it takes just over 2 hours. So it does take some time, but it is does not take over my life. It took me a few months to acclimatize, where I would get home, eat as much as I could stomach then fall asleep, but now it doesn't really effect me much at all. There are two other guys who I see in the mornings and evenings who go the same distance, and all of us kept going through the rather brutal winter we had in Europe. So if it is something you really want to work up to, then it is totally possible, it just takes some time to train your body. Good luck!