Books like Who Was Mark Twain?
April Jones Prince
Who Was Mark Twain? is 105 pages, about 1 hour 56 minutes at 250 words a minute.
12 books to read next
How long each takes
The Endless Steppe 4.5 h 
Hole in My Life 3.7 h 
Guts 2.7 h 
My Life in Dog Years 2.5 h 
My Own Two Feet 4.8 h 
It Came From Ohio! - My Life As a Writer 2.9 h 
Flora and Tiger 1.1 h 
Laura Ingalls Wilder 4.4 h 
Enchanted Air 3.5 h 
Works 7.3 h 
Jacky Daydream 6.5 h 
Brown Girl Dreaming 6.8 h Bar height shows length. Estimated at 250 words a minute.