I can't go to a movie at the theater and NOT get a drink and some snake grub... but that causes me to have a hard time not going to the bathroom during a typical hour and a half long movie. A 3 hour movie?! I'ma need a break time... didn't they do that when "Titanic" was in theater? Gave a pause halfway through?
They are saying DO NOT leave the theater once you hit the half way point or you WILL miss something big.
But in the first half there are some points where you can run out for a quick pee pee (lol)... CHECK OUT THOSE TIMES HERE (or click the image)