What's your longest-lasting hyperfixation/obsession?

Whether you're neurospicy (autism, ADHD, etc.) or not, how long did your obsessions last? Days, weeks, months, years, decades? What are your current obsessions and how long have you been interested in those?

For me, it was a near decade-long fixation on The Little Mermaid. Before I was introduced to Frozen in 2013, I experienced my first hyperfixation via meeting Ariel sometime in the 2000s, and that obsession lasted almost ten years - probably my longest-lasting flow state. Not only was I so obsessed that I've forever decided red is my favorite color (Ariel's hair color, duh), I also became fixated on mermaids as a whole. I would beg my dad to put in the DVD I can watch the movie (I know, I'm old 😭) so often to the point where he had to restrict my Little Mermaid TV time, lol.

No, this is not a competition!

5NAF has remained my longest lasting hyperfixation since I was a kid and it first became popular and its not like its something i'm constantly thinking of.... but its something I keep coming back to and I don't really get sick of it. I'm too poor to be a collector so i've not got a crazy 5NAF figurine collection or anything, if I could I 100% would. Ive been keeping up w the lore, Ive replayed specifically FNAF 2 multiple times, and rewatch gameplay (specifically markipliers) videos of FNAF annually. although Im not heavily involved with the fandom like I was when I was younger. I still try to keep up with the news thats surrounding it.