Books like The Rooftop Mystery
Joan M. Lexau, J. M. Lexau
The Rooftop Mystery is 64 pages, about 1 hour 10 minutes at 250 words a minute.
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How long each takes
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The Westing Game 3.5 h 
Grizzwold 1.2 h 
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Fancy Nancy 35 min 
Mr. Greedy 40 min Bar height shows length. Estimated at 250 words a minute.