how long does it usally take to learn a langauge

my first korean sentence 안녕하서ㅣ요 저는 림신유 어ㅣ요 저는 얼다섯 한극어 조금 할 수있어요 저는 뉴질랜드 어ㅣ서 왔어요 annyeonghaseyo jeoneun lem-sen-you eh yo jeoneun yol-dasoht sal imnida hal-gukeo jokeum hal suisseyo jeoneun noujillaendeu eseo wasseoyo Hello my name is lem sen you i am 15 years old i can speak a little korean i am from new zealand :DDDD