There are 8 movies (as the films split Harry Potter and the Deathly Hallows into 2 parts). To watch all of them would take a total of 19 hours and 40 minutes. The shortest is Harry Potter and the Deathly Hallows Part 2, at 2 hours and 10 minutes. The longest is Harry Potter and the Chamber of Secrets at 2 hours and 41 minutes.