When will sysntpd sync time?

when will sysntpd sync time?
when with CPE, sometime it does not get the new date.

killall tcpdump; \
tcpdump -eni any udp port 123 & \
/etc/init.d/sysntpd restart
service_triggers()
{
        procd_add_reload_trigger "system"
        procd_add_validation validate_ntp_section
}

is there another way?
what does it mean that procd_add_reload_trigger "system"

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