let's look at interstellar as an example. that movie is extremely complex and can be discussed and studied extensively. with regards to the overall story, not just what was shown in the movie, i would estimate that i grasped about 70% of everything the first time. it wasn't until about the 5th time that i reached about 95%. the difference is, even if you didn't fully grasp everything that happened inside and outside of the movie, it was still enjoyable on so many other levels. this movie is driven solely by the story which is nearly impossible to understand. and even if we somehow understand everything, the story still isn't very good. i know it's an indy film, but it has to be said that the acting was pretty bad (2 viewings)
real talk; if you looking for some kind of pretentious indie flick to justify your existence as movie buff and impress your plebeian friends, then Primer is for you.
now to look up the official time line to make sense of this movie.