Specifically, after about a year: https://news.ycombinator.com/newsfaq.html
> Are reposts ok?
> If a story has not had significant attention in the last year or so, a small number of reposts is ok. Otherwise we bury reposts as duplicates.
> Are reposts ok?
> If a story has not had significant attention in the last year or so, a small number of reposts is ok. Otherwise we bury reposts as duplicates.
> Be kind. Don't be snarky.
That said, I was commenting without any snark at all that discussions within a year are typically noted as dupe, linked a prior comment by dang which states this for an instance with an eleven month prior mention, and was simply stating that flatly and factually.
You might want to de-tune your snark detector a bit.