There's a 10-20 minute window for deleting messages. And then a ~1 hour window for editing them. So if you miss the delete window, you can just edit to "[post d

There's a 10-20 minute window for deleting messages. And then a ~1 hour window for editing them. So if you miss the delete window, you can just edit to "[post deleted]". But maybe there's some minimum karma needed. I don't remember. Edit: OK, 20-30 minute window for deleting.