Duck Soup—running time: 1 hour 8 minutes
Casablanca—running time: 1 hour 42 minutes
Citizen Kane—running time: 1 hour 59 minutes
North by Northwest—running time: 2 hours 16 minutes
Man of Steel—running time: 2 hours 23 minutes.
I will grant you that Gone with the Wind, Lawrence of Arabia and Schindler's List are long movies, but they fully justify their running time. Otherwise, if you make a movie longer than Casablanca or Citizen Kane, you better have something to say. Anyway, that's my opinion.