How soon to expiry does AutoSSL renew a certificate?
Each AutoSSL provider may wait for a specific amount of time to replace an AutoSSL-provided certificate before it expires. For example:
AutoSSL attempts to renew certificates that cPanel, L.L.C. provides when they expire within 3 days.
AutoSSL attempts to renew certificates that Let’s Encrypt provides when they expire within 29 days.
Hostname certificates are handled differently:
- Hostname certificates will be renewed within 3 days of expiry.
The checkallsslcerts Script [Hostname Certificates] (cPanel Docs)