I heard that it takes 3 months to start getting drops however, after just over a month, we got $10 each for Chumba, my wife got $20 Luckyland, and I got $5 Luckyland on May 16, 2023. I would be horrified to find out that I wrote a zillion envelopes only to have them rejected. We stopped mailing envelopes until we could see the fruits of our labor and get the money to reinvest into more supplies/stamps/etc.
As of today, we've sent in 220 total envelopes. We submit 1 entry each to these 3 companies every day. My wife and I started writing Chumba, Luckyland, and Pulse at the beginning of April.