20k words by the 0.75 words/token rule of thumb.

It's a lot, but for quick projects I don't do this. Only for one important project that I have ownership of for over a year.

Maintaining this has been worth it. It makes the codebase more stable, it's like the codebase slowly converges to what I want (as defined in the doc) the more inferences I run, rather than becoming spaghetti.