Books like El Guardián Invisible
Dolores Redondo
El Guardián Invisible is 396 pages, about 7 hours 16 minutes at 250 words a minute.
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How long each takes
In Cold Blood 6.5 h 
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Cross Kill 2.6 h 
The Murder of Roger Ackroyd 4.7 h 
The Law and the Lady 6.9 h 
The Girl in the Ice 7.5 h 
Calculated in Death 9.9 h 
Hurricane Season 4.2 h 
The Murder at the Vicarage 4.7 h 
Crooked House 4.1 h 
Vengeance in Death 6.6 h Bar height shows length. Estimated at 250 words a minute.