A 1 hour TTL will be increasing the DNS traffic quite considerably. I tend to set 24 hour TTLs on the grounds that DNS changes are rarely needed and usually planned well in advance, so you can reduce the TTL a few days before the change (to 15 minutes last time I did it) to get a quick change once the server IP is changed and then change it back to 24 hours once you’re sure the change doesn’t need to be undone.