I run many times a command
./letsencrypt-auto certonly --standalone --agree-tos --renew-by-default --preferred-challenges http-01 --http-01-port 9999 -d mydomain.org -d www.mydomain.org
and after certain number of times I got an error message:
There were too many requests of a given type :: Error creating new cert :: Too many certificates already issued for exact set of domains: mydomain.org,www.mydomain.org
On page https://letsencrypt.org/docs/rate-limits/ stated that
"The main limit is Certificates per Registered Domain (20 per week). "
If I got an error message at Wednesday then I can to repeat above command after 1 week at Wednesday or at next Monday?