I did a few contracts with commuting times of that length. They will eventually kill you.
My understanding from your epistolary comments, however, is that this was:
for the experience, which is something that people PAY to get;
temporary.
I wouldn't argue with your wife, either. You won't win. But, I would get a motor bike. NOT a silly high-powered one, a cruiser. As long as you don't drive like a teenager in front of a group of girls, and avoid rain (if you can), you should be fine. But, you won't win that argument. I was just telling you what I would do, because I can.
Anyway, just reassure her that you won't be doing this job for long (seriously, if you last more than 12 months I will buy you a motor bike).