Yeah, I think it depends on how someone defines "puberty" - it's often considered to begin at the breast bud stage and end at menarche for cis girls, but in reality their bodies continue changing for up to several years thereafter. I certainly knew lots of girls who weren't totally finished with pubertal changes until college age, making the total duration more like ~10 years.
Anyway, I'm coming up on four years and still seeing changes. 🙂 Not as dramatic as in the first year, maybe, but definitely progressing.