oh lol, I misunderstood the question. I misread HODL as "become a bitcoin maxi". That has been only 2 years.
But I accidentally been hodling since 2018 haha
Started a job in finance in 2019. Started learning about bitcoin a couple months before the markets went nuts (more then they already were). Grateful for the dips as I try to reach my initial stacking goal.
Depends on your definition of HODLing. I have bought stuff for most of what I mined back around and after the first halving, but I have some left, and I'm keeping it. If you mean de facto HODLing that part, around 10 years, if you mean as an intentional strategy, a couple of years.