Books like Harry's Mad
Dick King-Smith
Harry's Mad is 123 pages, about 2 hours 15 minutes at 250 words a minute.
8 books to read next
How long each takes
Crash 3.0 h 
Big Nate - In a Class by Himself 4.1 h 
Big Nate - All Work and No Play 2.6 h 
Horrid Henry and the Secret Club 1.8 h 
Horrid Henry's Revenge 1.8 h 
Bootsie Barker Bites 34 min 
Be a Perfect Person in Just Three Days! 1.4 h 
Horrid Henry Rocks 1.6 h Bar height shows length. Estimated at 250 words a minute.