It depends on many factors including: * how much time you have to study * your self-discipline, motivation and application to study * the quality of your language course and the experience and ability of your teacher (if you are attending a course) * the opportunity you have to practise with native speakers and no doubt many other factors.

what language are you asking about?

I was amazed at time to learn a language when I listened to TED TALK. Josh Kaufman had a presentation : learn everything with 20 hours practice, even a language (but not at master level), and Chris Londale had a presentation: learn a language within 6 months ( Good level). But for me, I think it will be 1-2 years and u have to study hard

I think 3 years! But you must remember YOU need everyday practice))