I did the HSKlevel.com test again. To get an estimate of where I am right now. When I answered the questions with ''yes I know the word" if I could read it and recognize it in reading, and pronounce it, I got around ~8000 words.
But I wanted to also establish an estimate of words I know only from sound. So I went through the test again, and only marked "yes" the words I could recognize from the pronunciation only. The result is interesting, as it gave me the estimate ~5250 words known (from listening). This is right in line with where Dreaming Spanish roadmap would put me: 5000+ words known once you reach Level 5. I'm in Level 5 for Mandarin (double the DS Roadmap so instead of 600 hours, after 1200 hours for level 5).
My key takeaway, is that apparently my listening skills still needed the recommended hours (so far). My prior reading-only practice did not significantly speed up my acquisition for recognizing words in listening. (My reading experience DID make more interesting stuff comprehensible input though, so I didn't have to use beginner-learner materials nearly as much as someone with no prior reading experience). And the 547 prior hours of listening I had in Mandarin, from listening-reading, DID contribute to my listening skills.
(There's probably an angle to explore there, of if you do listening-reading as ALL of your study time if both improve at similar rates, or if you end up leaning on one skill and still need to practice the other skill on it's own... my gut guess is that reading can develop alongside listening for a while, but eventually the listening-reading practice would primarily be reading practice and you'd tune out the listening. Based on my own experience practicing each skill. Even the Listening Reading Method, which I researched, includes a step of just listening to audio totally on it's own, I would guess to practice listening without the text as an aid to parse the sounds.)
My Chinese level statistics
I know 5250 words in Chinese
Take the test on www.hsklevel.com