Just remember, this isn't a competition, there is no "I've got a longer streak so I'm better." You may well have techniques that work phenomenally well at 6 days while someone at 200 days hasn't quite figured it out and got to that point with sheer stubbornness. Even if it were viewed as a competition, the only person you're competing with is yourself.
I might think about writing something formal at 90 days, but I'd still feel as if that weren't enough for myself. Maybe 150-180 days.
See, different standards for myself.