the fastest way of course is to move someplace where you are immersed in the language and have no choice but to speak it. Then you become fluent as fast as possible! It's hard to force yourself to study as hard as that will make you study. even a week or two in such a place will make a big difference.

I think it will take you 5 - 6 years. If you practice regularly.

Zooey is right. Total immersion is the key. My first stay in Germany was in a branch office. The first day, I asked everybody in the office to speak German to me unless it was absolutely important that I understand a technical point. The first six months were somewhat frustrating but encouraging, too. It took about a year before I was comfortable in all everyday situations. I got more fluent as time went on. My Chinese has progressed much more slowly because I am not forced to speak it all the time. I may have gotten lazy in my old age, too. One useful tip: When I learned to read, I started with mid-level children's comic books (Donald Duck, etc.). The language used is fairly simple and you have the pictures for reference. Gradually I moved on to newpapers and magazines, which I could read in public without looking strange. I kept telling the people at the bookstore the comic books were for my kid, even though I didn't have one.

depends on the person that's learning the language.each person has their own level of capabilities in learning things.there are such people who learns fast and there are some who learns slow..sometimes it also depends on how eager and determined the person is on learning english..i'll give you tips on how to improve your learning skills: 1)talk to people on english more often 2)watch english movies as much as possible 3)read english books out loud so that your speech will also improve

Good question. It depends on every individual. Learning is a process and also a skill. So, that means your success in acquiring a skill depends on how much effort and time you give in order to master it. Some people learn faster than others. Interest is also very important. No matter how much time you devote it will never work if you don't out your heart into it. One more thing, learning a language isn't for everyone. If English doesn't work for you then maybe you need to find another language that will suit you.