About thirteen months for me. I started off slow with one lesson a day, that then increased to an hour a day, then to an hour a day plus an hour of Rosetta Stone... and so on until it became the full time obsession that it is now. I still feel that my skills are primitive but hopefully they get a little bit better every day.
Andy-san, of course you will! Don't worry too much; acquiring a language takes time. You're studying constantly and that's amazing! I really have to follow your example... Whenever you have questions, feel free to ask us