How hard is it to learn Japanese? I'm in my late 20's and I'm reasonably smart. If I committed an hour or two per day to learning weeaboo-speak and moonrunes via a program or instructional guide/video, how long am I looking at until I start to understand/get the gist of a decent amount of sentences?

I've delved a little bit and I know some basics and some hiragana, but I'm nowhere near even broken Japanese.

Can anyone with some experience in this provide some insight please?