Not sure if dumb question but how do they actually build it? I don't mean the commands, I mean Chromium needs quite a few machines to build in a reasonable amou

Not sure if dumb question but how do they actually build it? I don't mean the commands, I mean Chromium needs quite a few machines to build in a reasonable amount of time. Do they have their own build farm? Or does some dude just leave it to build overnight or something on his personal machine every release?