So I recently sold my old Droid X on ebay and it sold for $144. They person that bought it has 100% feedback with 98 transactions. Now I have been on ebay for over 10 years but I just used it for buying not selling until recently. The other items I sold were paid for via paypal almost instantaneously, but this time is different. It has been 3 days since the auction ended and I sent an invoice about 12 hours after the auction ended. How long should I wait before contacting the seller about payment?