I was one a supervisor at a cinema. One day a couple walked up to me, asking for their money back. I asked why and they said the film was horrible. I asked how much of it they watched, and at that point the rest of the audience came out out of the screen.
They watched the entire film!
I told them if you didn't come to us in the first 20 minutes, then we won't do a refund, unless its for the quality of our copy of the film, the sound, screen too cold, etc. And even then we can double down if you managed to sit through THE WHOLE FUCKING FILM!