No dedicated study. Basically zero effort on your part is required, you just need to spend some time on it everyday. Your vocabulary will build itself over time

No dedicated study. Basically zero effort on your part is required, you just need to spend some time on it everyday. Your vocabulary will build itself over time if you keep engaging with the language. It takes ten years to mastery, just like with everything else. Six months until you can communicate in the new language. English is my second language and I speak from experience.