O. Henry books in order
15 books in the catalogue, about 167 hours of reading in all; the shortest takes 32 minutes and the longest 27 hours.
15 standalone books in the catalogue.
Standalone books
Cabbages and Kings 5.7 h 
The Four Million 4.8 h 
The Gift of the Magi 32 min 
The Ransom of Red Chief 44 min 
The United States in Literature [with Three Long Stories] -- Seventh Edition 15.0 h 
Great American Short Stories (2 editions) 9.4 h 
Understanding Fiction -- Second Edition 12.6 h 
Great Short Stories of the World 14.7 h 
The Last Leaf 48 min 
Prentice Hall Literature -- Platinum 27.3 h 
The 50 Greatest Mysteries of All Time 10.4 h 
Prentice Hall Literature--Timeless Voices, Timeless Themes--Gold Level 19.8 h Prentice Hall Literature--Timeless Voices, Timeless Themes--Silver Level 18.7 h 
Uncertain Endings 5.5 h 
Prentice Hall Literature 21.3 h