Books like An Artificial Night
Seanan McGuire
An Artificial Night is 371 pages, about 6 hours 48 minutes at 250 words a minute.
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A Kiss of Shadows 8.7 h 
A Stroke of Midnight 7.2 h 
Swallowing Darkness 7.2 h 
Seduced By Moonlight 6.8 h 
Divine Misdemeanors 6.1 h 
A Lick of Frost 5.0 h 
Blacklist 8.4 h Bar height shows length. Estimated at 250 words a minute.