I don't even mind waiting a day or so for the first responder, but it's the turning off of the conversation without any updates that gets me. Change your mind? Fine, let me know and we'll part on friendly terms. Make arrangements for me to contact you at a certain time for your address but then don't respond to any messages.... I've got a few choice words for you.
Lot's (ok, 4 ) of initial tire kickers who either didn't follow through, or who were trying to conduct business via 1 sentence messages every 2 - 4 hours (sorry, but if you can't commit to respond back in a timely fashion when I'm responding within a minute or two, I don't want to do business with you), but ultimately sold within 24 hours for my asking price without any attempts at haggling suggests I had the pricing right.