The most important obstacle I (well, and the 75& of my class which dropped out already...) encountered was just the scariness and lack of support. With the risk of getting personal.
year 1: attended this night class of Japanese. The bad timing helped, but I got stuck at hiragana. I did attend a few more couple of months but I felt extremely behind and just got nervous and dropped out.
year 2: enrolled in Uni. Learned hiragana in a week. Cursed at myself for not studying more the previous year. Kept at it for a year, got to N5 level(N4 if it wasn't for the grammar).
year 3: Various personal issues+some bad encounters at uni(also all the friends I made failed the year...) and I kind of took a break. smart.fm closing down didn't help my recovery. This was a year off.
year 4(ok, technically 3 and a half): get back to my studies following various episodes. Signed up for the N4 and basically recovered everything I had forgotten in 2 months and then some... and here I am now. Aiming for the N2 this December since it's the last year in which I can dedicate so much time to Japanese.
So yes, technically it did only take me a year and a half of(not so intense) active study to get to N4, but I was slowed down by the obstacles and general scariness of the language. I think it's kind of normal? I did run into many of my former colleagues, which were only now taking he N5/N4 for the same reason. It's common, at least where I'm from. Japanese can be scary, and unless you have a motivation of steel or an excellent teacher or a good guide or a good support group or what not then the scariness can get to you. And that's ignoring the fact that each person can only dedicate so much time to it. Or the fact that some are just more natural learners than others, or found a good method quicker, could afford it or what not.
(and now that I realize it it's only 3 years and a half since i started. Yay for a bad time sense!)
P.S.
Quote:Happen to have bad grammar material/class focused on "survival" Japanese that only teaches you useful set phrases you don't understand? "Let's go through Kana in a semester, and 10 kanji if we're fast."
Fun fact. We learned how to say 日本の生活に慣れましたか in our first month. However, we only learned the verb 慣れます last week...so about 1 year and a half afterwards. My favorite part was that after we read 慣れます aloud the teacher pointed it out, something among the lines of "You recognize this verb, right?" and half the class uttered the question on command.
Edited: 2012-01-16, 8:50 am