>>629
Answered my own question with a Google Search. According to this post, it'll take two years:
http://visualnovelaer.wordpress.com/2010/09/30/how-to-read-visual-novels-in-2-years-time-step-by-step-guide/
I personally disagree with the method (learning from visual novels only, as opposed to real life, will logically lead to you thinking and writing like an anime-character or an otaku) but will probably incorporate it into my study after the first year working with Core2k and live action shows, movies, and news broadcasts (and hopefully newspapers) in Anki.
If there's any other general advice that the more experienced folk here could give me, it would be much appreciated. I've been trying to scan through some of these threads, but there are many posts. I'm currently following the AJATT method, more or less (except I'm keeping the RTK stories on the back side of the card instead of on the front side).