It is quite odd to call this advent when it ends halfway into the month rather than on Christmas. But I will have fun doing them either way
From https://adventofcode.com/2025/about:
" Why did the number of days per event change? It takes a ton of my free time every year to run Advent of Code, and building the puzzles accounts for the majority of that time. After keeping a consistent schedule for ten years(!), I needed a change. The puzzles still start on December 1st so that the day numbers make sense (Day 1 = Dec 1), and puzzles come out every day (ending mid-December). "