Books like Nightmare Room - Camp Nowhere
R. L. Stine
Nightmare Room - Camp Nowhere is 145 pages, about 2 hours 40 minutes at 250 words a minute.
12 books to read next
How long each takes
Coraline 3.5 h 
City of the Beasts 7.2 h 
Runaway Ralph 3.2 h 
The Blood of Olympus 9.6 h 
Hilda and the Black Hound 1.2 h 
Starcrossed 9.4 h 
Groosham Grange 3.6 h 
Coraline 3.2 h 
Bat in Bunk Five 2.8 h 
Caitlin the Ice Bear Fairy 1.5 h 
Laura's Luck 4.0 h 
City of Bones 9.4 h Bar height shows length. Estimated at 250 words a minute.