When does PR change?

When does PR change in relation to the update?

[doc]

Does PR change before the update, during the dance or at the end of the update? Or any time?

[dazz]

It usually changes about 1-2 days after update starts.

[lazerzubb]

[webmasterworld.com...]

7. I see an update on www2, how long will it take before I see the new pagerank?
Google picks there pagerank values from www.google.com (the PR toolbar value) and you will see it when you see the new index on www.google.com, but make sure it’s somewhat stable, because people in Europe and America might see a different index sometimes. Also a small tip for the europeans: If you want to see if Google is showing the americans a different index, you can try using the "Translate this page" under "Page Info" button on the Toolbar, and you might see a difference in the number of results returned.