There are very different meanings about 'knowing a language'. Some people think that they know some language while actually they were just memorized several hun

There are very different meanings about 'knowing a language'. Some people think that they know some language while actually they were just memorized several hundred of common sentences. Other people claims that they know some language, because they can read with permanent use of a dictionary, other think that they are good, while they did not bother to learn correct pronunciation, and so on. I think it is very hard to know more than two languages well, especially such different like western and eastern ones. I have a dream, for example, to learn Japanese language, because I'm an anime fan, but I'm also realizing that this is almost impossible for me. Even my very weak English took several years of learning, because learning means practice, and this process is very slow. And if language is really difficult, like the Sanskrit it is impossible for sure. So, when someone claims that he know some language, I assume that he should have at least 5 years of continuous practice, or it is just an empty claim.