Books like Robur the Conqueror
Jules Verne
Robur the Conqueror is 188 pages, about 3 hours 27 minutes at 250 words a minute.
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The Jewel of Seven Stars 4.2 h 
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Tender Is the Flesh 4.1 h 
The Sinister Trophy 3.6 h 
An American Tragedy 14.5 h 
The Mediterranean Caper 4.7 h 
Excavation 7.8 h 
The Gunslinger 4.8 h 
No Plan B 7.0 h Bar height shows length. Estimated at 250 words a minute.