I set all my TTLs for a lot of things to 60sec and never much cost.

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You should probably read the following 🐶🐾🫡

https://blog.apnic.net/2019/11/12/stop-using-ridiculously-low-dns-ttls/

The comments are best part. 🤣

For geo relays I have no qualms setting low TTL for rolling other local VMs in as primary for that region.