Let's Encrypt, the nonprofit that provides free TLS certificates for millions of sites, has announced that it will be moving to certificates with 64-day lifetimes on February 10, 2027:

This means that any certificate we issue or renew on and after that date will have a 64 day validity period, and we expect the last 90-day certificate to expire on May 11, 2027. We will not revoke valid certificates as a part of this process.

https://letsencrypt.org/2026/10/07/64-day-certs.html