But how many? The starting number is usually 13 - Thomas Jefferson's connection to the courts of appeal. But as *certiorari* has doubled the load, which suggests 26 to some scholars.
Jonathon Turley thought *de minimis*, in 2012, was 19. (http://www.washingtonpost.com/politics/white-house-lawmakers-prepare-for-supreme-court-health-care-ruling/2012/06/14/gJQAzsKldV_story.html) His study of the topic has resulted in higher and lower numbers since then.
5/