What is the minimum amount of time you need to wait before calling out to an NTP server again? (wait at least 64/128/10000/etc. seconds)

What is the minimum amount of time you need to wait before requesting time again from an NTP server? I've seen a wide variety of answers, but I'm looking to get a good ballpark.

Is it OK to query an NTP server every 5 minutes? I've heard if you query too much they'll IP address ban you and I'm using the NIST NTP server so I'm worried about getting IP address banned from a US government server.

I'm looking to not have to deal with an RTC in my hardware prototype.

1 answer

  • answered 2022-02-05 16:31 Andrew

    It depends on the server; typically, NTP will start at 64 seconds and stabilize up to 1024 seconds. Cisco uses iburst by default, but they tend to stay up; otherwise iburst can cause issues/blocks.

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