Books like Separate Is Never Equal
Duncan Tonatiuh
Separate Is Never Equal is 40 pages, about 44 minutes at 250 words a minute.
10 books to read next
How long each takes
The Story of Ruby Bridges 35 min 
Leon's Story (Sunburst Books) 2.0 h 
Freedom Walkers 2.1 h 
I Have a Dream 44 min 
Martin Luther King, Jr 1.2 h 
The Civil Rights Movement 44 min 
The Rock and the River 5.6 h 
Freedom's Children 3.5 h 
A Dream of Freedom 2.9 h 
Voice of Freedom 50 min Bar height shows length. Estimated at 250 words a minute.