Books like Lieutenant Hornblower
C. S. Forester, CS Forester
Lieutenant Hornblower is 306 pages, about 5 hours 37 minutes at 250 words a minute.
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How long each takes
Midshipman Bolitho and the Avenger 2.6 h 
The Life of Nelson 5.7 h 
Salt to the Sea 7.7 h 
The Man in the Iron Mask 8.9 h 
The Dragon and the Raven 4.7 h 
Puck of Pook's Hill 3.8 h 
Letters from the Lighthouse 5.3 h 
Beric the Briton 6.5 h 
Out of Many Waters 3.7 h 
The Shakespeare Stealer 4.0 h Bar height shows length. Estimated at 250 words a minute.