I don't see a need for any rules beyond what we already have regarding bumping and thanking (or thanking and bumping). I have never waited a specific number of posts, though I may start doing that (if I ever manage to post any more songs...). In the past, [I think] I've waited a "few" posts or days, whichever came first, before doing my thanking. I really haven't put a lot of thought into it. I do want to be more mindful, in general, though, so this will go on my "mindful list".