I'd say one every couple of years. https://letsencrypt.org/docs/certificates-for... | Hacker News

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tgsovlerkhgsel on June 29, 2020 | parent | context | favorite | on: Chromium and Mozilla to enforce 1 year validity fo...

I'd say one every couple of years.

https://letsencrypt.org/docs/certificates-for-localhost/ has great documentation on that topic, including more examples.

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