This is currently my second semester taking a Russian course (currently enrolled in FLR 102). I took two years of french in high school and achieved a beginner/intermediate sense of french and I was never very satisfied with how much I learned. However, I feel like I have already surpassed by french skills in Russian, but in a completely different way. Rather than focus on the verb/conjugations/irregularities like our class did in french, my russian class is focusing much more on the overall grammar structure of russian. This is something which my french class wasn't great about.
Anyways, my point being is, when did most people on here start to become comfortable with the Russian language (or whatever second language which you are proficient at)? Just to avoid confusion, I would define comfortability as the ability to understand and write in a language with the occasional small error (but the ability to figure out what you did wrong if corrected), having a large vocabulary of words, and general understanding of how the language's grammar system works.