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Re:S3 was down by pmlnr on Friday September 15, 2017 @05:34AM (#15255792)
There is a TTL you can set in your record. Yes, you can set it to a second.

However, the case of a static website is not really hitting me as something can't afford a few seconds downtime...

Re:S3 was down by dna_polymerase on Friday September 15, 2017 @11:43AM (#15258072)
In my experience I can set the TTL to whatever value I want, last mile providers don't really give a shit about that and just cache it for how long they want.