Good one Albert!! As far as holding something--It depends on whom you're dealing with. Unknown buyer??- About 10 sec.is fine.--Lots of feedback buyer/seller?? Longer for sure.I've been promised a MO that never came--or a paypal that never was posted.(Both this year) I think the type of questions asked,and the time between communication tells me a lot. If there are 14 similar adds--expect lots static.If it's a unique item--first with the funds,is my buyer. My bank won't accept promises; for deposits. If it's an expensive item the lookers are easy to "see".I have twice returned a buyer's funds because they didn't send the money as soon as promised.--If I say I'll wait,I do--but it better be "as promised". I always ship the day the funds arrive;I expect if the buyer wants the item--they will be just as prompt. I use a case by case, logic. Many are similar / many are different.