@Crowlover: Pretty sure Celestia meant for Nightmare Moon to be trapped forever.
Did the song really say 3 months specifically? I must be misremembering.
Life is simple: it has no nontrivial normal subgroups.
"3 months of Winter coolness, and awesome holidays…"
Koe ga kikoeru/Yuku beki michi yubi sashite iru
Sarasara nagaru kaze no naka de hitori/Watashi utatte imasu
Hug a Sableye~ :3
Pretty sure Celestia meant for Nightmare Moon to be trapped forever.
I like the idea that Celestia intentionally made it temporary so she could have time to find new
Eo H bearers to cure Luna.
Life is simple: it has no nontrivial normal subgroups.
Plus, Hearthswarming Eve.
Also, Spikes invitation in Ticketmaster mentions the 24th day I think.
Life is simple: it has no nontrivial normal subgroups.
As to timing, I could see them having slightly different set up, but at most only off by a few days per year to give every month the same number of days. which would be awesome.
Build a fool proof system, and the world will create a better fool.
My random thoughts

Winter is actually pi months but tehy round it to 3.
Life is simple: it has no nontrivial normal subgroups.
I kinda hope they go into space just so we can see what the planet they're on looks like.
If it was supposed to be permanent, why would the legend specifically say it would end after 1000 years? I doubt Tia would do that to Luna.
Build a fool proof system, and the world will create a better fool.
My random thoughts
@Crowlover: Damn, I really thought I got it that time.
The weird part is that they have scientifically accurate comets.
Life is simple: it has no nontrivial normal subgroups.
Someone kills a mule in Postman?
Life is simple: it has no nontrivial normal subgroups.
I don't know anything about Postman but it sounds really weird out of context.
Life is simple: it has no nontrivial normal subgroups.
Has it been explicitly stated how many days are in an Equestrian week?
The way Twilight's calendar pages are drawn in "Lesson Zero" makes it look like each week has either four or eight days... and her line "Not every other week! Not every ten days! Every. Single. Week!" implicitly rules out the four-day week theory.
MCs on the paper with their murder metaphors need to deal with the literal resurrector.