Time lapse photography can create some pretty impressive visuals. I think we mostly see time-lapse photography in non-fictional works about nature, plants, or the stars. But sometimes it's used in horror (decay), science fiction, or simply to show the audience that time is passing quickly as an alternative to a montage. A filmmaker might show a day passing really quickly to give a vague sense of anxiety. Or a vampire/horror flick might show the rapid change of day into night to signal impending doom.
That makes me wonder, what is the longest known period over which time-lapsed filming has been performed?
I'm just curious because its difficult for humans to totally predict the visual effects of the passage of massive amounts of time. What does the longest known segment of time-lapse look like?