Explaining that to clients is hard. We say "it'll take about 72 hours for everything to sync over". If we're switching them to a new IP, we'll leave the old ser

Explaining that to clients is hard. We say "it'll take about 72 hours for everything to sync over". If we're switching them to a new IP, we'll leave the old server on until 72-96 hours after we update DNS. We seriously still see traffic on the old server that long after the change, and ~72 hours is about how long it takes to get ~99% updated.