Books like Treason's Harbour
Patrick O'Brian
Treason's Harbour is 368 pages, about 6 hours 45 minutes at 250 words a minute.
12 books to read next
How long each takes
Mr. Midshipman Hornblower 4.7 h 
Ramage and the Drum Beat 5.0 h 
Lord Hornblower 4.5 h 
Flying Colours 5.1 h 
Sharpe's Trafalgar 5.4 h 
Hornblower and the "Hotspur" 6.3 h 
Governor Ramage R.N 6.3 h 
Passage to Mutiny 6.8 h 
Ramage 5.9 h 
Hornblower & the Crisis 3.2 h 
Dark Watch 7.5 h 
The Terror 14.1 h Bar height shows length. Estimated at 250 words a minute.