[Teracotage]

It all depends on immersion and motivation, if you desperately need to learn a language you will work hard to get there. Immersion will expose your listening skill to recognize unique sounds in the target language. That is not to say it makes it easier for you to utter them, it just helps with the early comprehension. I met an Urdu speaking taxi driver who spoke English and Arabic as if he was a native speaker of both, after 6 months of merely listening to the radio in his car.