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  This is my own Meta, but I hold it's highly consistent with what we see.
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  Raw speculation, and I'll probably be tweaking the dates as I go, but good enough for our purposes. I don't want to make the window any longer, and it seems clear that the HoE was a Hail Mary play to try and win the war against Prime (By nuking everyone else he'd conquered! The First Ones were pretty terrible!), so I can't imagine they lasted long after Mara defected.
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  Given what we know of the HoE, Mara, and First Ones destructive magical mining projects, to me Etheria feels less and less like a place that was 'Home' to Generations of First Ones, and more like a Project Site - huge numbers of people rolling in and popping up settlements seemingly overnight as they worked on their Last Great Hope.
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  Our timeline anchor. Probably occurs near the end of Prime's war with the First ones.
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  Working backwards from Light Spinner; setting him as 14 in that episode
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  Mystery Portal snatches up a Galactic Horde Ship and it one (surviving?) occupant.
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  Again, limited flex on this event; shortly after/concurrent with the fall of the scorpion kingdom
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  She can't be more than a year older than Adora and Catra. Implies she was born a few years after the "alliance" with the Horde.
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  Light Hope only sort-of successfully kidnaps a baby via portal. Number based on interviews (+5 years following Hordak's arrival), although I may shift if Micah's timeline gets too futzed.
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  I put him as a hair older than Glimmer
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  This makes Micah 20/21; I might yet add a year or two of padding onto Adora's arrival to push this number up
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  First alliance created
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  Based on how Glimmer is described/her lack of memory of her father, she was unlikely to be older than 5 when the war ended. 4 year duration is based on WW1.
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  I don't think the box is strictly canon, but the idea that Catra was a little older when she was abandoned/adopted tracks with her various traumas and abandonment issues.
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  Micah's "Death", the shattering of the organized resistance against the Horde.
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  Making Adora 18/19 at the start of the show.
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  Making stuff up! Although figuring 2-3 months between recruitment missions seems reasonable.
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  See notes under Perfuma
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  Ditto other recruitment notes
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  Bow and Glimmer getting captured, Entrapta's "Death"/defection, The temporary fracturing of the new alliance.
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  Major character introduction, Adora start's getting really fixated on the legacy of SheRa
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  And that gives us one year to season 1. Brightmoon defended, Catra promoted, etc.
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  Will add other entries, but the first three episodes of S2 are pretty tightly linked together in terms of time, and are unlikely to span more than a month or so.
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  The rest of Season 2 fits in here somewhere, but I'm more willing to be vague than I am with Season 1
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  This is one of the weird things where it "feels" like maybe a week or two for the BFS (who are very focused on their goal), and feels more like at least 2-3 months for Catra/Scorpia (Who are futzing around and enjoying themselves)
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  Catra returns from the Crimson Wastes, Portal gets activated, etc. End of Season 3 in a bit less than a year.
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  New Season New Year
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  More or less arbitrarily selected.
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  Season 4 ending. a whole bunch of events cascade within at most a couple of days.
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  New Season New Year. Scorpia's first mission, so it can't be that far off Prime's arrival.
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  Again, no more than a few weeks from S5E1, given how everyone is acting
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  This season is going to have a lot of 'dead' time where it's basically "And then they sat in a ship for months"
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  Catra rescued, Prime's server room smashed, WH dragged along.
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  More time in Spaaaace. Again, it's been long enough that the folks on Etheria are getting outright antsy,
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  FInally back on the planet.
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  Sets us up for the "we need to disrupt the signal" angle of the finale
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  Horde Prime defeated once and for all.