Books like The Secret of Killimooin
Enid Blyton
The Secret of Killimooin is 149 pages, about 2 hours 44 minutes at 250 words a minute.
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How long each takes
They Both Die at the End 7.0 h 
The Sea of Monsters 5.2 h 
Adventures of Huckleberry Finn 6.4 h 
The Dragonet Prophecy 5.9 h 
Rising Storm 5.9 h 
Moon Rising 7.1 h 
Lost Continent 6.2 h 
I Will Surprise My Friend! 1.1 h 
Varjak Paw 4.7 h 
Spy School Goes South 6.5 h 
The Iron Trial 5.6 h 
The Pigman 3.3 h Bar height shows length. Estimated at 250 words a minute.