[Twirrim]

If things behaved nicely, yes. There's all sorts of weird DNS caching behaviour out there. It's not unusual to find folks with DNS servers / clients that are caching records for 1 hour+, and then of course there's people running super old versions of Java that used to cache DNS forever by default (before JDK 6). There's a very clear set of user that seem to cache for 10-15 minutes, regardless of any DNS TTL.

[marcosdumay]

You can't fix systems that ignore your TTL by specifying lower TTL values.

[Twirrim]

Sure. My general approach is to use lower TTL values (~ 5 minutes) and just accept that if people do dumb things, they just have to put up with things randomly breaking unexpected.