Good question. I would say that the word enough, when it comes to learning, should never be used. Learning is a continuous and never-ending process. What limit us is our own set of limitations. We establish them and then confine ourselves into those because we control better. We follow the pattern accordingly. Learning won’t ever be enough if your mind is set this way.
When it comes to learning languages, enough doesn’t bring knowledge and expertise. Enough doesn’t place you in the real cultural environment and enough won’t ever make you feel confident. Dare to know more, every day more. Be open, be curious. It’s an endless process and never enough.