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.

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