Books like Gods and Myths of Northern Europe
H. R. Ellis Davidson
Gods and Myths of Northern Europe is 250 pages, about 4 hours 35 minutes at 250 words a minute.
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How long each takes
Teutonic Mythology 10.8 h 
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A History of Pagan Europe 4.8 h 
Norse Mythology 8.7 h Bar height shows length. Estimated at 250 words a minute.