Sorting by duration

I admit, my request may not be that valuable to others. Apologies if I'm being selfish.

I was searching for books that are a similar length to my daily commute, and thought it would be useful if my library could be arranged by duration.

Having the ability to find content that fits perfectly with the duration of a commute, flight, car journey, etc, without having to cut the story short would be such a nice addition to what is already a ingenious app.