Books like Nightmare Academy
Frank E. Peretti
Nightmare Academy is 311 pages, about 5 hours 42 minutes at 250 words a minute.
12 books to read next
How long each takes
A Woman Named Damaris 4.1 h 
Tenderness 4.0 h 
Jumper 6.5 h 
Thirteen Reasons Why 5.9 h 
Welcome to Night Vale 7.6 h 
The Tender Years 5.0 h 
The Runaway 14.1 h 
Every Heart a Doorway 3.2 h 
Her Fearful Symmetry 7.5 h 
Smaller and Smaller Circles 6.6 h 
The Night Gardener 7.0 h 
Trace 7.9 h Bar height shows length. Estimated at 250 words a minute.