Headless TCP services losing connection

I am reading this page:
In the english version, it saids If istio-citadel is deployed, Envoy is restarted every 45 days to refresh certificates. But in the chinese version, it is 15 minutes.
Is this a translation issue, or is it related to istio version?
Why 45 days? Can I change it?
What is the time in a day that it restart? Will it choose a time that the traffic is low?

I think it’s mostly likely the Chinese doc is outdated. Regarding the 45 days, @Oliver could help take a look at this? Thank you.