Books like Robert Kennedy and His Times
Arthur M. Schlesinger, Jr.
Robert Kennedy and His Times is 1,077 pages, about 19 hours 45 minutes at 250 words a minute.
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How long each takes
Huey Long 16.2 h 
Faith of My Fathers 6.4 h 
Living History 11.4 h 
Blacklisted by History 12.2 h 
Means of Ascent 9.4 h 
Profiles in Courage 4.9 h 
The Dark Side of Camelot 9.1 h 
The Rise of Theodore Roosevelt 16.3 h 
Keeping Faith 11.4 h 
The Audacity of Hope 7.6 h 
Che Guevara 13.4 h 
John Adams 13.8 h Bar height shows length. Estimated at 250 words a minute.