How long is a Let’s Encrypt SSL certificate valid and how do I renew it?

Let’s Encrypt SSL certificates are valid for 90 days.

Ecenica will automatically renew your Let’s Encrypt SSL certificates on your Ecenica web hosting accounts within 29 days of the SSL certificate’s expiry date. Your Ecenica issued Let’s Encrypt SSL certificate will continue to be renewed for the lifetime of your Ecenica account.