I think when someone has placed an order, both parties should check their PM's on the market site on a regular basis. the two parties need to check them at least every few hours during the day. If it doesn't have to do with an order then I don't really care about the timing. But, when I want to get items out quickly and safely and I have a question for the buyer/vendor I want to be able to get an answer within a few hours. I don't expect it in 20 minutes, but having to wait more than 24 hours to get a response is a little too long. Im not talking about casual pm's between one another, i mean when a customer has an order placed, they (and the vendor) should check their PM's at least every few hours. Is this unreasonable?