IMO "Advent of Code" only determines the timeframe in which it happens, not the amount of puzzles it must contain. It could just as well be four puzzles, one for each sunday of the advent, or any other amount, as long as they are released within those roughly four weeks before christmas.
Eh, the implication has always been that it's a Christmas calendar where you open one door per day until it's Christmas eve - just with code riddles instead of chocolate.
> Advent calendars in their earliest forms were invented approx. 80 years ago.
Well, Wikipedia starts its "History" section in 1945, which is 80 years ago. But what it says about advent calendars in 1945 is that they were lower-quality reprints of earlier designs. This strongly implies that they weren't a new concept in 1945.
The German wikipedia is more interested in the concept and cites the word Adventskalenders to the novel Buddenbrooks, which features one set in the year 1869 but was published in 1901. Either way, the calendars were clearly an established cultural phenomenon well before 1945.
Looking at the talk page (for the English article), it seems that the history section was provided by a "translation group" from their translation of a matching section of the German article. It's not clear why they began with the post-war period; the German page goes back much further than that, which was also true at the time they provided their translation. But this does explain why the English "history" section begins by referring to prior context that doesn't exist in the English article.
I'm not arguing this point. I conceit, I thought the sentiment was obvious. If it wasn't—and if read literally—I thought that that statement was the weakest and most uninteresting part of what I shared. However, to my surprise, this statement, and its specific interpretation, is what people found compelling!
We have a thing called "Three Kings" (aka. "three wise men") in Poland, that falls on Jan 6th. If My Math Is Correct™, there's 12 days between the Christmas day (Dec 25th) and Jan 6th, so maybe the song is about this period?
Really? The name of the event is "Advent of Code". Having 25 puzzles is easily its most strongly-determined aspect.
You could argue for 23-29 puzzles, or perhaps for 5, but at 12 what's the name supposed to refer to?