Books like The Nature of Greek Myths
G. S. Kirk
The Nature of Greek Myths is 332 pages, about 6 hours 5 minutes at 250 words a minute.
7 books to read next
How long each takes
The Complete World of Greek Mythology 4.4 h 
Greek Mythology 2.6 h 
Lost Goddesses of Early Greece 2.3 h 
Bibliotheca 5.4 h 
Ancient Greek Religion 4.1 h 
The Routledge Handbook of Greek Mythology 14.2 h 
A Handbook of Greek Mythology 6.7 h Bar height shows length. Estimated at 250 words a minute.