could be a week or they can tinker with it for a month, it’s google, so you never really know.
Acctually the PR was updated in the beginning of December. What we see now is just an update of the toolbar display (and that’s why it does not seem to reflect on the results themselves). And it’s usually done within 2 days – you might see every now and then a different PR, but it’s just a DC “trailing behind”.