Books like The Right Thing to Do
James Rachels
The Right Thing to Do is 305 pages, about 5 hours 36 minutes at 250 words a minute.
9 books to read next
How long each takes
Readings in Moral Philosophy 12.6 h 
Ethics 9.1 h 
Great Traditions in Ethics 6.8 h 
Morality Play 2.9 h 
Ethical Choices 7.6 h 
The Moral Life 17.3 h 
The Moral of the Story 11.4 h 
The Right Choice 6.2 h 
Contemporary Moral Arguments 13.3 h Bar height shows length. Estimated at 250 words a minute.