We have compiled all practical information we could find and written it up at Numbers you need to know. It’s a long list of restrictions, rate limits, and other useful information to keep in mind. Here’s a few selected points that we found interesting. Big thanks to schoen from Certbot/EFF for pointing out numerous inaccuracies.
HTTPS in browsersDo you know that Let’s Encrypt now issues 80% of all publicly trusted certificates globally?
Do you know that your Let’s encrypt certificate is in fact valid only 89 days and 23 hours?
Do you know that you are only allowed to request only 2,000 OCSP requests per second from each of your servers?
Do you know that in one week you can request 20 new certificates followed by 1,000 renewals, but if you do it the other way round the requests for new certificates will be rejected?
Do you know that if you regularly request a certificate every