Years ago, 24 to 48 hrs was the case for a DNS resolution update. But I have redirected DNS many times over the last few years and it resolves correctly, worldw

Years ago, 24 to 48 hrs was the case for a DNS resolution update. But I have redirected DNS many times over the last few years and it resolves correctly, worldwide within a few minutes. Almost everytime. Occasionally, I will see a few locations in India or China cache for longer than the ttl but never longer than 4 to 6 hours. And this isn't just a record cache. Even a nameserver change seems to get picked up in less than 15 minutes worldwide.