Books like E-commerce for Dummies
Don Jones, Mark Scott, Rick Villars
E-commerce for Dummies is 417 pages, about 7 hours 39 minutes at 250 words a minute.
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The Internet for Dummies 7.1 h 
Linked 5.6 h 
Discovering Computers 2018 9.8 h 
Computer Networks 13.7 h 
Internet 16.4 h 
Kill All Normies 2.2 h Bar height shows length. Estimated at 250 words a minute.