Books like Modern Constitutions
K. C. Wheare
Modern Constitutions is 216 pages, about 3 hours 58 minutes at 250 words a minute.
8 books to read next
How long each takes
The Constitution of the United States and Related Documents 56 min 
Constitution 6.9 h Our Constitution 5.8 h Document of Destiny 14.3 h 
Constitution of India 14.3 h The 1987 Constitution of the Republic of the Philippines 25.9 h La Constitución Bolivariana 3.2 h 
Constitución Política 2.7 h Bar height shows length. Estimated at 250 words a minute.