Yeah, it's the same as my favorite "slooow" film.
It's seven and half hours, so with 2 intermissions, it's a 9 hour+ experience. Some people left the theater, to eat, or whatever, but not me. I stayed in my seat the entire time.
It would be impossible to stay that focused at home. If you get the chance to see it in a theater, do it. It's worth every grim second of your time.
Pick up the phone and call your friends! They miss the sound of your beautiful voice! They want to laugh with you! They want to share their minor grievances with you! And they want to do it in real time and OUT LOUD!!