Books like The Monster of Florence
Magdalen Nabb, Douglas Preston, Mario Spezi
The Monster of Florence is 346 pages, about 6 hours 21 minutes at 250 words a minute.
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The Concrete Blonde (Harry Bosch) 8.4 h 
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Legion 4.9 h 
The Nursing Home Murder 3.6 h 
Angel of Darkness 7.0 h 
The Anonymous Venetian 5.5 h 
Acqua Alta 6.6 h 
One by One 9.4 h Bar height shows length. Estimated at 250 words a minute.