Books like Timed Readings Plus in Science
McGraw-Hill - Jamestown Education, Glencoe McGraw-Hill
Timed Readings Plus in Science is 118 pages, about 2 hours 10 minutes at 250 words a minute.
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How long each takes
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Sadlier Phonics 4.1 h 
Scythe 8.2 h 
I Survived 2.9 h 
Catalyst 7.9 h 
Arduino 35 min McGraw-Hill Reading 3.8 h Bar height shows length. Estimated at 250 words a minute.