Books like Darwin's Watch
Terry Pratchett, Ian Stewart, Jack Cohen
Darwin's Watch is 368 pages, about 6 hours 45 minutes at 250 words a minute.
12 books to read next
How long each takes
Annihilation 3.8 h 
Storm Front 6.5 h 
God's Secret Formula 4.0 h 
The Invisible Man 3.1 h 
The Secret Doctrine 10.1 h 
The Hobbit 5.7 h 
The Big Picture 8.8 h 
Microbiology 17.2 h 
Astrophysics for People in a Hurry 3.8 h 
The Phenomenon of Man 5.9 h 
A Brief History of Everything 6.2 h 
Cosmos 6.5 h Bar height shows length. Estimated at 250 words a minute.