Books like The Long Dark Tea-Time of the Soul
Douglas Adams
The Long Dark Tea-Time of the Soul is 285 pages, about 5 hours 14 minutes at 250 words a minute.
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A Kiss of Shadows 8.7 h 
Parable of the Talents 7.8 h 
Blood Rites 7.2 h 
The Last Graduate 6.9 h 
Gun, with Occasional Music 4.9 h 
Imajica 15.8 h 
All the Birds in the Sky 6.4 h Bar height shows length. Estimated at 250 words a minute.