Books like Priest Kings of Gor
John Norman, Ralph Lister
Priest Kings of Gor is 321 pages, about 5 hours 53 minutes at 250 words a minute.
12 books to read next
How long each takes
Foundation 4.4 h 
The Temporal Void 13.0 h 
Aliens 4.7 h 
The Cole Protocol 6.8 h 
Deliverer 6.6 h 
Contact 7.9 h 
The Great Hunt 12.3 h 
Star Wars - Thrawn - Alliances 7.6 h 
Revenger 7.8 h 
A Hymn Before Battle 8.7 h 
Children of Time 11.3 h 
Alien 3 4.4 h Bar height shows length. Estimated at 250 words a minute.