Books like Spartan Gold
Clive Cussler, Grant Blackwood
Spartan Gold is 502 pages, about 9 hours 12 minutes at 250 words a minute.
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Clear and Present Danger 12.6 h 
Past Tense 7.5 h 
Indiana Jones and the White Witch 6.2 h 
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The Prisoner of Heaven 5.8 h 
The Vision 7.6 h Bar height shows length. Estimated at 250 words a minute.