Books like SilverFin
Charlie Higson
SilverFin is 352 pages, about 6 hours 27 minutes at 250 words a minute.
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How long each takes
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Eagle Strike 6.0 h 
Scorpia 6.7 h 
Snakehead 7.5 h 
Ark Angel 6.1 h 
Never Say Die 6.6 h 
City Spies 7.0 h 
Crocodile Tears 7.1 h 
The Sleepwalker 6.1 h Bar height shows length. Estimated at 250 words a minute.