It totally depends on your situation. I said 6 months to be large but it can be closer to 3 if you’re a dedicated learner with a lot of time (like the typical u

It totally depends on your situation. I said 6 months to be large but it can be closer to 3 if you’re a dedicated learner with a lot of time (like the typical univ student). The trick is to practice with a native speaker from day one, and hear recorded syllables a lot. Optionally one can use Praat to check if their f0 follow the tone contour.