Books like The Stainless Steel Rat
Harry Harrison, Carlos Ezquerra, Kelvin Gosnell
The Stainless Steel Rat is 160 pages, about 2 hours 56 minutes at 250 words a minute.
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The Robots of Dawn 8.2 h 
The Complete Robot 10.2 h 
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Welcome to the Monkey House 5.7 h Bar height shows length. Estimated at 250 words a minute.