The conversation between human and AI assistant.
What was the language in Japan before they wrote their own and before adopting China's alphabet?
And how long did it take for them to fully adopt this new writing system?
It actually took several centuries for Kana to become the main writing system in Japan. It wasn't until around the 9th century AD that Kana started gaining widespread use, and even then it was mainly used by women and non-aristocratic people. It wasn't until around the 13th century that Kana became widely used among all classes of Japanese society.