Think of it more in terms of hours. Looking at my spreadsheets the year that I really drilled in on listening (2021) I clocked 380 hours. I remember feeling like I was “ok” but not happy and in 2022 I clocked 331 hours. In 2023 I stopped tracking partway through the year because it no longer seemed as important (and I was tired of tracking). So ~700 hours to reach a level of ‘I feel good enough about this I don’t see a need to strictly work to progress anymore’ 
Note that a lot of my listening was dramas and movies which have a lot of dead air. If you’re primarily practicing with more dense sources like podcasts or audiobooks you can probably cut that number.
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