Books like Data Science at the Command Line
Jeroen Janssens
Data Science at the Command Line is 191 pages, about 3 hours 30 minutes at 250 words a minute.
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DAMA-DMBOK : Data Management Body of Knowledge 10.8 h 
Understanding Big Data. Analytics for Enterprise Class Hadoop and Streaming Data 2.6 h 
Hadoop 12.6 h Bar height shows length. Estimated at 250 words a minute.