I think the last answer to your question was misleading. You may send as many requests a day as you want. You can only receive 20 responses per day. However, if you sent out 100 requests, you can get responses from previous days to help you reach the goal faster. For example, I sent out requests to all of my neighbors for keys yesterday. I got in my 21 (because of Stormie) and then that was it. But because I had sent out so many yesterday, when the new S8 day started, I started to get more keys in from yesterday?s request. So I had 20 Keys before I woke up this morning.