Ok, so less than 10 minutes after I lowered my BUY IT NOW price, it sold. It's been 4 days and this person still hasn't paid. It's a textbook for school, and in most places the semester is already in session. I'm afraid if she doesnt pay, I won't be able to sell if I relist because then most students would already have their books. I did not put "Immediate payment required [with buy it now]" Usually, for BUY IT NOW, don't you have to pay right away? How much longer should I give this buyer?