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Maybe for those cases where one can get random IP from their ISP and has a e.g. hopto.org configured?

One would probably be OK if it was 5 or 10 mins, but it depends on what's behind that dns entry and how often ISP can change the IP.

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Do any ISPs generally change dynamic IPs more often than modem/routers reboot?

Some ISPs do it on a daily schedule. I know that the German Telekom rotates customer IPs every night at 01:45 AM, because a friend of mine is with them and that's the time when he drops from the video conference for a minute (if we stick around that long).

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