What problem are you encountering?
I worked on dns gslb for a long stretch at Facebook^WMeta, and didn’t see an excess of bad actors. The vast majority of users follow our dns changes in an orderly fashion. Most delay sources to clients themselves.
I worked on dns gslb for a long stretch at Facebook^WMeta, and didn’t see an excess of bad actors. The vast majority of users follow our dns changes in an orderly fashion. Most delay sources to clients themselves.
The "up to 48 hours" is commonly used because that's the ttl of many things that matter. For instance, NS records for names in the .com zone have 48 hour ttls.
You can give better estimates to your users if you know the state you're transitioning from. For instance, a brand new .com domain would be 15 min negative ttl plus the .com zone file update frequency.