how long do YOU wait

I been getting the phrase: I’m asking for a friend. Probably 6 or 7 right now. I have 10 things that have been agreed waiting to ship in just the last few months. These are agreed upon deals. But some have been shipped to the next buyer in line after a week with no contact from the ghost. Now I see where some members sell to whomever has the cash in hand rather than the first inline. I have always went down the list of ppl from first contact, but that may change. Kim