> Of course, a service can switch to a new cloud provider, a new server, a new network, requiring clients to use up-to-date DNS records. And having reasonably low TTLs helps make the transition friction-free. However, no one moving to a new infrastructure is going to expect clients to use the new DNS records within 1 minute, 5 minutes or 15 minutes. Setting a minimum TTL of 40 minutes instead of 5 minutes is not going to prevent users from accessing the service.

Note that you can still get the benefit of a low TTL during a planned switch to a new cloud provider, server, or network even if you run with a high TTL normally. You just have to lower it as you approach the switch.

For example, let's say you normally run with a TTL of 24 hours. 25 hours before you are going to throw the switch on the provider change, change the TTL to 1 hour. 61 minutes before the switch, change TTL to 1 minute.