Books like Farnham's Freehold
Robert A. Heinlein
Farnham's Freehold is 304 pages, about 5 hours 34 minutes at 250 words a minute.
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Level 7 3.5 h 
The Gods of Mars 3.7 h 
Hyperion 8.8 h 
Captive of Gor 7.5 h 
Thuvia, Maid of Mars 3.2 h 
The Chessmen of Mars 4.3 h 
Star Wars 7.2 h Bar height shows length. Estimated at 250 words a minute.