I find the terminology on that site rather confusing. According to the Foreign Service Institute, it takes 1100 contact hours for professional proficiency (about C1 on the CEFR) (for a learner whose native language is English). The figure is very fuzzy, since there are a lot of factors that come into play, but it's twice as long as the time needed for a more closely related language like French or German. Imagine trying to learn French in one month. Unless you still have the language somewhere in your subconscious mind from when you were three (not that three year olds really speak that well), I'd say reaching even a B2 level in two months would be exhausting. You should gain the ability to interact somewhat in daily situations, but as far as language level, A2 (advanced beginner) or maybe (setting your sights really high) B1 (intermediate).