Hm, I do not know if any of that is relevant, since I’m particularly slow in terms of progress, but sure.
I have first learned my hiragana ~16 years ago, started properly learning Japanese ~13 years ago and finished my first non-manga book (painfully) ~5.5 years ago.
Here’s a breakdown by actual kanji/vocab knowledge, which I think might be more relevant as it abstracts away the time I took to get to those levels.
In terms of actual book reads, it took me about 100~120 novels (and a quadrillion manga) to get to my current speed. That being said, I noticed while reading the 本好き series (so, around the 100 book mark) that I was throttling down myself, trying to properly read every kanji and character. Turns out that if I just quickly glance at them, my brain can fill in the rest, I don’t need to check every damn stroke. Of course, that only works for words I know well, so I don’t know how early I could have tried that. Still, that’s both faster and closer to the way I actually read in English or French.