I commute to the office 1-3 times a week, it's about 30 minutes on the train + some walking.

I've gone through so many books it's crazy :)

With audiobooks I can start listening the second I step out of the door and stop while I take my jacket off in the office. With e-books I usually just read on the train.

Most books aren't that long, around 5 hours a week of reading just during your commutes is quite a bit.