Clarification of functionality for Services: ACME Client: Certificates:

[ClintonWestwood]

Hello, within  Services: ACME Client: Certificates: ACME CA Settings there is an option "Renewal Interval". Is this how often the task runs, or is it how long after a certificat has been issued that it will be renewed.

For example, Is it that Setting: Cron will run the update procedure every day at midnight for example, but the rule in Renewal interval is what determines whether or not a certificate should be renewed? Therefore if my Renewal Interval is set to 60 days and my Let's Encrypt certificate is for 90 days, then my certificate will be renewed after 60 days since creation. In other words, if my certificate is 61 days old at the point of the job running, it will be renewed, but if it's 59 days old, no renewal will take place?

I am aware I've probably repeated myself a few times.

Thanks.