Pending refund with Paypal????

I returned a card that was purchased through ebay and the seller refunded my money. Now Paypal has had it in "Pending" status for 4 days now. Anyone know how long they will do this with a refund? I think its complete BS that they would do a hold on a refund.
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The seller likely refunded through his sweep-account.
ACH - checking account - can take a few days to be released by PP.