With default options, the result was almost instant
- At > 500x speed
Used -compression_level 12, finished in ~ 7 seconds
- speed = 48.9x
Then I used multi_dim_quant
- After ~ 10 minutes, I checked the speed to be ~ 0.02x. So thought it would take an hour or so. 1.30 seconds worth of audio was encoded
- It's been over 2 hours now.
  - Shows 1.46 seconds of audio encoded with current speed = 0.00017x

Considering running it in a VM, so I can "pause" it whenever I need to restart my computer.

Update:
size= 123KiB time=00:00:02.82 bitrate= 356.3kbits/s speed=4.68e-05x
It stopped trying to use layman notation.
I'll need to restart soon-ish, but I'll see how far this goes and if the 2.82 seconds of audio is even listenable.

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[–] ulterno@programming.dev 2 points 2 weeks ago

I am currently thinking that it might just be the problem with me having set too high parameters, but considering that mpv is unable to recognise the format even after 2 seconds of audio, perhaps there is some bug.