Books like Exploring Christian Heritage
C. Douglas Weaver, Rady Roldán-Figueroa, Brandon Frick
Exploring Christian Heritage is 468 pages, about 8 hours 35 minutes at 250 words a minute.
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How long each takes
Martin Luther 5.2 h 
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IES Lighting Handbook 6.6 h Bar height shows length. Estimated at 250 words a minute.