ken_b - 6:47 pm on Nov 2, 2013 (gmt 0)
So it's finalized when it's in your bank.
Maybe, maybe not, the AdSense TOS [google.com] includes this handy dandy line in the Payments section ....
(b) require you to refund us within 30 days of any invoice, any amounts we may have overpaid to you in prior periods.
Wouldn't that be fun!