however , please note, a chargeback through c.c company , which in turns makes paypal take away your money , can be done even after 90 days. i heard there is really no time limit on this.
although according to paypal and c.c. companies , the majority of chargebacks occur within the first couple of months, and a chargeback to happen after a year, while possible, is very rare.
this is where paypal should own up. in the event of a charge back in later time, they should take the hit and not affect you the seller. it is owning up to their said 'insurance' policy on seller protection. if seller did everything right and all is well up to that point of the chargeback a year later let say, paypal should own up and pay for that hit.