Question: how long would it take to learn how to read japanese?
Answer: Honestly if you want to get it down in two years, you'll probably have to study WaniKani for kanji and vocab 6–7 hours a week, and then maybe 3–4 hours of grammar and 4–5 hours of watchin' TV. Literacy in two years is probably possible, but you're going to have to be quite efficient and study more than 3hrs a week.