Books like The Rubadub Mystery
Enid Blyton
The Rubadub Mystery is 232 pages, about 4 hours 15 minutes at 250 words a minute.
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The Long Secret 5.1 h 
Wolf Rider 3.7 h 
The Edge of Forever 4.7 h 
Beetle Boy 5.6 h 
Blood of My Blood 8.8 h 
Too Many Secrets 2.1 h Bar height shows length. Estimated at 250 words a minute.