>>36001350Well, my fellow Anon, THAT is a fucking convoluted mess to work out, but I shall do a valiant job of working it out while this episode plays.
It's a well established fact that the events comprising of Seasons 1 through 3 took place over a single year - therefore, that is one year.
In the previous episode - A Health of Information - Pinkie's song mentions that it has been a year since the Cake twins first sneezed.
If we're INCREDIBLY generous and assume the Cake twins were born toward the latter half of that first year, that means we potentially have a total of two years as of Season 7. However, said episode also has a time skip of a few months, muddying where that leaves us.
In Season 8, we've got two issues; During "Non-Compete Clause" it's shown that Fluttershy has won Teacher of the Month nine months in a row, and the finale states that it's only been one semester at the school - which my cursory knowledge of American education means it's been four to five months.
Therefore, going by information provided in the show filtered through my sleep-depraved brain, it has been at best three years in-universe between the beginning and the end of the show, MAYBE four.