It depends on the bank that issued the card. Most have 60-90 day limits, but a few have no limit - I suppose that it depends on how valuable a customer the card holder is. I have heard of chargebacks for over a year past the purchase date, but never seen it myself.
Paypal might have a limit of 45 days, but the if the purchase was made with plastic, the credit card can claw back the money from paypal, which passes it on to you.