I wonder what is the majority-accepted amount of time one should wait before reposting a story? I know some people can't stand any reposts at all, but I think h

I wonder what is the majority-accepted amount of time one should wait before reposting a story? I know some people can't stand any reposts at all, but I think https://xkcd.com/1053 https://xkcd.com/1053 shows us we should be more tolerant of it because people are always seeing things for the first time, and nobody goes back to read old news.