I recently answered a question for the first time on this SE. It received one comment about sharing the source of my opinion and the typical copy and paste "welcome" comment.
Less than a day later, it got deleted.
Even though I've been reading this SE for quite a while, I never heard of the "back it up" policy and didn't find it in the suggested links, listing signs of a bad answer, only reading about it by chance in the process.
While it may just be an unfortunate combination of time zones, I got no notifications about the comments or the deletion and only checked up on the question out of personal interest.
While I'm, of course, pretty upset and discouraged by this, I mainly feel bad for the question, which now has no answers again, instead of one that may have been salvageable enough to stay on this site and/or hopefully help OP in some way.
So is there a minimum wait time for a user to adapt their answer to feedback, once it has been given, or is it just luck, once the first delete flag has been given?