still don't get what longest film ever is

The Cure for Insomnia is the other one that comes up. 1987, roughly 87 hours, mostly an artist reading his own enormous poem. It held the record for years before Logistics.

depends what you count as a film. the one usually cited is Logistics, a Swedish experimental thing from 2012 that follows the journey of a pedometer back to where it was made, and it runs for something like 857 hours, so over a month nonstop. nobody watches it as a normal film obviously. if you mean an actual narrative movie that got a proper release, you're looking at stuff in the 7-10 hour range instead, which is a very different list.