On February 10, 2027, all Let’s Encrypt subscribers will move to certificates with 64 day lifetimes by default unless they select an even shorter lifetime (45 or 6 days, as previously announced). 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.
It’s not a Let’s Encrypt limit https://cabforum.org/working-groups/server/baseline-requirements/requirements/#632-certificate-operational-periods-and-key-pair-usage-periods
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