It all depends on how much the purchase cost, if it was a lot of money Paypal will make sure that they get the money from yoou BEFORE passing it on to the seller. so they tell the seller that you are paying with an e-cheque. If the amount is small, and there is probably a trigger on this, what happens if Paypal pays the seller before collecting the money from your bank account, this usually is about four days later. If you check back on previous purchases comparing the date/time of the payment (when you paid using Paypal) and when the money left your bank you will notice a four day delay in collecting the money from your bank.