train wrote: Thank you alot that was nice :)
but how long it will take to learn anew language like Korean or Japanese
All depends on what you mean by "learn"... or at what point you will consider yourself to have "learned" the language. According to the US Foreign Service Institute, the hardest languages for native English speakers to learn (and it does depend a lot on your native language) are Arabic, Cantonese, Mandarin, Japanese and Korean (with Korean actually considered the most difficult), and for their staff (who generally already know more than one language) it takes an average of 2200 hours or 88 weeks to learn to read and speak. (That's 25 hours a week, or 5 hours a day if you rest on weekends, and in a formal classroom environment).
Yonsei University's Korean language program (which is both immersion and intensive) takes 1.5-2 years to complete. (They do 200 hours a term for 6-8 terms, or 1200-1600 hours)
But either of these options will take you to the level where you can do university studies or conduct high level business in Korean. If your goals are more modest (like basically understanding dramas without subtitles, or being able to hold basic conversations when traveling in Korea) then obviously the time necessary is much less, but it will also depend on whether your self study is more or less effective than these formal classes.
So 6 months I think is ambitious to reach a truly fluent state, unless you are a language genius, or your native language is not English, but something closer to Korean or Japanese. But 6 months is certainly enough time to feel like you are making progress and starting to understand more of what you hear.