How long does it take for Japanese language learned in adulthood to become part of our long-term memory?

I have been learning Japanese on an off for a decade. Earlier it was only textbook knowledge but recently, while working as a bilingual, I’ve been using it practically on a daily basis at work with native people. But i feel exhausted having to think in and switch between two languages, even if one of them is my native language.

I realised that this could be because I’m having to constantly use my working memory to focus while communicating in the non-native language. If used daily in practical situations, how long does it usually take to become part of long-term memory so that it’s not so tiring to use?

4 comments
  1. It’s the same as any other new language: Constantly keep using it until it becomes second-nature. It could take a long time, depending on how much you’re using it in your daily life, but eventually it’ll be as easy as snapping your fingers.

  2. In my experience, if you are fully immersed, the first 6 months or so see a rapid decrease in the amount of mental power required. Then it plateaus, but within a few years it becomes pretty similar to your native language. If you are not fully immersed, I expect it takes longer. (Also, obviously it depends heavily on effort, natural ability, and what language(s) you already know.)

  3. Japanese is a category IV language. It will take 8 years to reach the level that a learner of Spanish, Norwegian, etc. would reach in 2 years.

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