Books like Olódùmarè
E. Bọlaji Idowu
Olódùmarè is 222 pages, about 4 hours 4 minutes at 250 words a minute.
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Odu Ifa 7.9 h 
The Handbook of Yoruba Religious Concepts 3.1 h 
Ọdun-Ifa = 12.5 h Yoruba Heathenism 59 min Bar height shows length. Estimated at 250 words a minute.