Denis Villeneuve’s “Dune: Part Two” won’t be screened until November, but I’m hearing that the current cut of the film is very lengthy. How does 3 hours 15 minutes sound to you? This does not mean that the released version will be that long, but it is an indication, a tease, if you will, of how epic this second chapter will be. For comparison’s sake, the first “Dune,” released in 2021, was 2 hours 35 minutes. As Roger Ebert once said, “No good movie is too long, and no bad movie is short enough.”