Folks on FB are all atwitter and atweet about "Oppenheimer". Some are moaning over its announced length, others are complaining that they don't know what people mean when they say the movie is very long.
To me, it means that it's three hours, as advertised, but that it is intense and can tax a person intellectually, emotionally and physiologically. That tells me there is a lot of content and much of it is disturbing. That can take a lot out of a person.
"Schindler's List" is such a movie, but I would not be the person I am today had I never seen it. Movies change me, some in minor ways, but others in major ways.
Apparently, "Oppenheimer" will be an IMAX experience where such showings are available.