Books like Groupthink
Irving Lester Janis, Irving L. Janis
Groupthink is 350 pages, about 6 hours 25 minutes at 250 words a minute.
12 books to read next
How long each takes
Diplomacy 16.7 h 
Thinking in Time 6.0 h 
The Trial of Henry Kissinger 2.9 h 
In Cold Blood 6.5 h 
Soft Power 3.7 h 
Essence of Decision 6.2 h 
Thirteen Days 3.7 h 
Sybil 8.2 h 
Who Rules the World? 6.8 h 
War on Peace 7.9 h 
A Problem from Hell 12.0 h 
Business Adventures 7.3 h Bar height shows length. Estimated at 250 words a minute.