Books like Regarding the Pain of Others
Susan Sontag
Regarding the Pain of Others is 142 pages, about 2 hours 36 minutes at 250 words a minute.
8 books to read next
How long each takes
A Different Kind of War Story 4.7 h 
Kill Anything That Moves 7.6 h 
The Better Angels of Our Nature 14.7 h 
Tribe 3.1 h 
The Goodness Paradox 7.3 h 
Race and Reunion 9.7 h 
On Killing 6.9 h 
Frames of War 3.8 h Bar height shows length. Estimated at 250 words a minute.