Let's Encrypt Goes to 64-Day Certificates: When Does Your ACME Client Actually Renew?
Summary
The article analyzes Let's Encrypt's move to 64-day certificates and how different ACME clients renew within ARI windows, including experiments across certbot, acme.sh, and lego. It provides practical guidance for operators to audit renewal timers, cron scripts, and deployment hooks to ensure timely renewals as lifetimes shrink to 45 days by 2028.