Books like The Salmon of Doubt
Douglas Adams
The Salmon of Doubt is 299 pages, about 5 hours 29 minutes at 250 words a minute.
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How long each takes
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The Dreaming Void 11.9 h 
Essays 5.2 h 
Heretics 3.1 h 
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The Long Utopia 7.3 h 
Project Hail Mary 9.1 h 
Essays 3.9 h 
Tekwar 5.6 h 
The Defendant 2.4 h Bar height shows length. Estimated at 250 words a minute.