1 hour
There is a Failed Validation limit of 5 failures per account, per hostname, per hour. This limit is higher on our staging environment, so you can use that environment to debug connectivity problems. Exceeding the Failed Validations limit is reported with the error message
too many failed authorizations recently. Rate Limits - Let's Encrypt
F*ck that tutorial that binds you to manual renewals.
This is the answer you're looking for:
It's not a good answer, but if you want a better one you need to use a dns authenticator plugin. (Or you might think a bit harder and maybe realize you don't actually need a wildcard, and automate all of it.)
ANYWAY, we go back to the shitty tutorial. I found the actual proper documentation on using let's encrypt certificates on bitnami apps. Read this:
https://docs.bitnami.com/aws/how-to/generate-install-lets-encrypt-ssl/