Hello! If you sent a request to 200 neighbors, only 20 of them will get the requests on that day. Then, the next day, another 20 will get the request and so on, until the queue of requests is empty. If you send your requests to over 20 neighbors, there is a chance that it will randomly select an inactive neighbor who wouldn't see your request. We usually suggest to send your 20 requests per day to neighbors that you know are more active. Hope this tip helps in getting more Unique Oil from your neighbors!
Good luck!