I've seen a couple previous posts on this, but can't find an official answer anywhere. Once a DNS challenge is successful is there a period of time where that response is cached for subsequent challenges, or will a new response be necessary every time?
Once successfully completed, an authorization is cached for 30 days as long as subsequent requests use the same ACME account key.
This is officially documented here:
Note that the limit may get shorter in the future, e.g. 7 days.
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