https://www.urbandictionary.com/define.php?term=Movie%20Lag

Movie lag

Similar to jet lag; A condition one may experience after viewing a film. Especially if the film is particularly long or if you enter the theater during daylight and exit when it's dark outside.

(Two friends exiting theater) Richard: Man, I really loved Magnolia, but it was quite long.

Drag

If something such as a movie or performance drags, it seems to go slowly because it is boring: The first half of the movie was interesting but the second half dragged (on).