Books like The Science of Discworld
Terry Pratchett, Ian Stewart, Jack Cohen
The Science of Discworld is 400 pages, about 7 hours 20 minutes at 250 words a minute.
12 books to read next
How long each takes
The Hobbit 5.7 h 
An Absolutely Remarkable Thing 6.5 h 
Storm Front 6.5 h 
Streams of Silver 5.4 h 
Grave Peril 7.9 h 
The Icewind Dale Trilogy 18.9 h 
The Elfstones of Shannara 11.2 h 
Death Masks 7.6 h 
Starless Night 6.2 h 
The Elvenbane 7.6 h 
The Lady of the Lake 10.2 h 
Passage to Dawn 6.5 h Bar height shows length. Estimated at 250 words a minute.