4 ms·

And this doesn't include the messiness in the decisions themselves. Judges often edit the decisions for some time after they are published. For example, Souter

• squigz 9mo ago
  > Having received my letter, Justice Souter notified the Reporter of the error, and at 535 U.S. i appears an erratum, directing that “Homer nodded” be inserted—eight or nine years after the opinion was delivered. I would guess corrections so long after publishing are relatively rare - but if they're also marked as such, it seems a slight stretch to say it's still being "edited" 9 years later