Yeah I just got my stats back up from not quite understanding how this worked. But we do have a whole 24 hours to respond. I responded within just 2 minutes of 24 hours to save myself from a ding last week. I didn't know the message was there because I must have viewed it previously and it was no longer showing as unread. So, now I go to my inbox everyday to be sure I don't have anything unanswered going on 24 hours. Also, I respond to spam messages and then I immediately block them.