Books like Out of Time's Abyss
Edgar Rice Burroughs
Out of Time's Abyss is 136 pages, about 2 hours 30 minutes at 250 words a minute.
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The Invisible Man 3.1 h 
Deep Storm 7.9 h 
Cat's Cradle 4.2 h 
We 4.1 h 
In the Name of Science 6.7 h 
Phantastes 3.6 h Bar height shows length. Estimated at 250 words a minute.