How long (in days) should one wait for a contact back from a listing agent before you either complain to their management, or move on to other possible listings. I'm messaged through the HAR site several agents over the last few months as well as called the numbers listed on the specific listing asking for additional info, but have yet to even get a courtesy response. Do agents in TX generally not respond directly to buyers and only deal with other agents? I know different policies and procedures exist in different areas.