how long do YOU wait

If you are serious about selling or buying you should be on the spot answering questions and getting shipping estimates. If you don't have the time don't string others along. A seller may have a half dozen prospective buyers while you are dragging your feet.
Sellers should post their ads when they have some time after posting to answer questions. Dropping an ad and disappearing for a couple days isn't good.
Communicate, Communicate, Communicate!! Send those personal messages and CLEAN OUT YOUR INBOX!!!!:BangHead::BangHead::BangHead::lol: