Books like Leadership on the Line
Ronald A. Heifetz
Leadership on the Line is 252 pages, about 4 hours 37 minutes at 250 words a minute.
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How long each takes
Leadership 6.3 h 
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Transforming Leadership 5.9 h 
Conscious Business 8.3 h 
Leadership and Management in Healthcare 5.7 h 
Being the Boss 5.5 h Bar height shows length. Estimated at 250 words a minute.