I couldn’t find the renewal time interval.
The problem is that there’s a rate limit when trying to obtain certificates and if you hit the limit, certificate renewal won’t work for an amount of time. That’s why it’s not recommended to force a renewal by restarting traefik, see How to Force-Trigger Let’s Encrypt Certificate generation without restarting Traefik - Traefik v2 - Traefik Labs Community Forum and TLS certificate error with mail host aliases - #17 by davidep
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