sup all, yes the update is going on and my pr is flunctuating...how long does it take to settle down?
Since G only updates the tool bar 4-5 times a year - I'd say it will mellow out in a couple of weeks.
It usually takes a few days for it to settle down. It's only the toolbar being updated apparently, so it shouldn't affect your SERPs anyway, just the visible PR on the Google toolbar.