20 minutes is a very short period of time. There could be many reasons. Perhaps he is chatting with someone at the moment. (If the site has that feature.) He may not actually be at his computer right now. There are many times I walk away from my computer without signing out of the site I'm on. He also may not want to respond to quickly because he's worried it may make him look to eager. Those are just on the top of my head. Try not to get discouraged.