Is there any documents that describes the validity period of the DNS challenge?
I'm going to use acme DNS challenge to issue SSL certificate.
But in our organization, it takes few days to change DNS records.
So I want to know how long a TXT record value is available to challenge.
When I actually tried the DNS challenge, I received a response with "Strict-Transport-Security: max-age=604800" and "expires: DATETIME A WEEK AGO".
It means validity period is one week?