Comment by toast0

Maybe up to a point, but really the TTL should be set for how long is acceptable for traffic to continue to flow to the old destination after a change. That's not necessarily correlated with time between changes: just because a service IP hasn't changed for two years doesn't mean I would want to wait a day for most traffic to move.

Of course, the reality is some traffic will continue to flow to the old destination for as long as you care to measure. There's plenty of absurdly broken DNS caching out there.