I’ve been learning for the past two years. The first year on my own, and then I took two courses at university. I found that learning on my own seems to be way more effective than the classes at university. I mainly focus on speaking and understanding the language, so I try to watch Japanese TV (recently I dropped the English subtitles), listen to simple podcasts, and watch videos on YouTube. I don’t want to completely neglect reading and writing, so I’m also learning kanji using Heisig’s method. Though it will probably take me until mid-next year to work through that book.