My fault? More like my consciously made trade-off of time vs speed.
And it worked stunningly well. You see, I figured that whatever I targeted I'd do about 80% of the time. So, 35 a day is about ~1000 a month, and I reckoned I could hit that 10 months in a given year.
My first year of Japanese was basically RTK + KO2001 and JLPT2 grammar study. I was a few points off passing JLPT2 inside 1 year of study. At the time it say I had around 2 to 3 thousand vocab, and could read all Jyoyou kanji, plus understand almost all sentence structure used in daily life.
My 2nd year of Japanese I acquired an additional 10k vocab. I passed JLPT2 and came a few points short of passing JLPT1.
6 months into my 3rd year of study I passed JLPT1 and never touched studying Japanese again.
It has always been a big part of my life since then, and I credit that brutal effort with me really turning my life around. It was an absolutely epic adventure.