How much time do you need to beccome perfect in English?(or another language)?

 
I have been learning English my whole my life. When I was a child, I had been visiting at kindergarden, I started learning English. It was a simple English. When I was young, I had been studied at school, and I was learning English. It was becoming harder and harder. When I was 13, I started to learn English with a special teacher. When I was 15, I abandoned lessons with the teacher. Now that I am older, I have been (or: I am) studying in university (how to say I am studying there till present), and I have also had been having English lessons for the last year. When I was 22, I decided it was time to learn English seriously and I started some English courses. School, which I use to study in, has 15 levels, and when you get started, you need to pass an exam to determine your level. I was at the fourth level; now I'm on the seventh. And while I am studying in that school, I do and redo exercises and learn a lot of new words besides my homeworks. But I can't understand, when I'll achieve perfection.
What about you?

How do you define 'perfect'? Some random thoughts: Set yourself some realistic goals. If you can make yourself understood, you are already doing well. If you can speak a language without first consciously translating every word in your head, you might consider that you are on the way to becoming fluent. It's tough, but I don't think there's a 'perfect' English; it's a communication tool which people use to the extent that they need it. Learning in a classroom is limited - beyond the basic concepts (grammar, sentence construction, vocabulary) the incentives are minimal and progress can be slow. If you live in an English-speaking environment, the learning curve will be much steeper, but also much faster. Find and take advantage of every opportunity to think, read and speak the language. Every day, for as long as it takes!