Books like No Enemy But Time
Michael Bishop
No Enemy But Time is 397 pages, about 7 hours 17 minutes at 250 words a minute.
7 books to read next
How long each takes
The Adventures of Ook and Gluk, Kung Fu Cavemen from the Future 3.2 h 
The Inheritors 4.3 h 
Who We Are and How We Got Here 6.8 h 
The Land That Time Forgot 4.0 h 
Humans 7.0 h 
Catching Fire 5.7 h 
Hybrids 7.3 h Bar height shows length. Estimated at 250 words a minute.