No idea how much, but here's the movies I know I've seen the most:
O Brother Where Art Thou? Star Wars I, IV-VI City Lights Monty Python and the Holy Grail Kung Pow: Enter The Fist Citizen Kane Lawrence of Arabia 8 1/2 Moulin Rouge! Being There North By Northwest
400 times? We can't be using the same rules here, I'm talking about viewings while you seem to be counting minutes here
Do you realize that 400 viewings for one movie equals once per week every week for almost eight years?
Theatrically, I saw The Empire Strikes Back 14 times during its original theatrical release (including 3 consecutive showings on one day) and seven more times when the special edition was released.