[__float]

What do you recommend then? DNS doesn't usually change that often, but if you mess it up when it does, you're in for some pain if TTLs are high!

[htgb]

Not the one you're replying to, but I'd keep TTL high normally and lower it one TTL ahead of a planned change.

[kenniskrag]

I would define high as "double time needed to fix a dns issue" and account for weekends

[stouset]

This is the way.