Sleepy brain me sometimes makes truly confounding choices.

I elected to build openjfx from source overnight rather than installing the bin package.

It got to 35% in 8 hours.

So in 16 hours it should be completed! Hope it does not fall flat on it's face and do the checksums!
And we just signed a new climate accord....

@NeatNerdPrime Actually, it turns out that it builds WebKit as a dependency, and counts it as a single step among hundreds, leading to the counter stepping from 34% to 35% during most of the build process. I killed it like 15 minutes before it would've finished.