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after search around, I believe the answer is that it's dynamic and ranges from minpoll minpoll parameters that can be edited from the ntp.conf:
maxpoll maxpoll
These options specify the minimum and maximum poll
intervals for NTP messages, in seconds to the power of
two. The maximum poll interval defaults to 10 (1,024 s),
but can be increased by the maxpoll option to an upper
limit of 17 (36.4 h). The minimum poll interval defaults
to 6 (64 s), but can be decreased by the minpoll option
to a lower limit of 4 (16 s).
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NTP polling interval in Linux?
