Books like Spy Ski School
Stuart Gibbs
Spy Ski School is 350 pages, about 6 hours 25 minutes at 250 words a minute.
12 books to read next
How long each takes
Harriet the Spy 5.5 h 
Don't Judge a Girl by Her Cover (Gallagher Girls) 5.1 h 
United We Spy 5.4 h 
Frostbite 6.0 h 
Maximum Security 5.5 h 
NERDS 5.8 h 
Scorpia 6.7 h 
Geronimo Stilton, Secret Agent 2.2 h 
Snakehead 7.5 h 
Class A 5.6 h 
Never Say Die 6.6 h 
Divine Madness 7.0 h Bar height shows length. Estimated at 250 words a minute.