Books like Colonel Sandhurst to the Rescue
Marion Chesney
Colonel Sandhurst to the Rescue is 176 pages, about 3 hours 14 minutes at 250 words a minute.
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A Most Unusual Governess 4.6 h 
Moonspun Magic 7.5 h 
One-Man Woman 3.5 h 
The Impertinent Miss Bancroft 3.8 h 
Wicked Widow 6.0 h 
Powder and Patch 3.8 h Bar height shows length. Estimated at 250 words a minute.