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is there something in xbian that would make it call to pool.ntp.org for a network time reference? How can I check this?
Can I change it to the NTP server I'm running on my router?
I'm noticing DNS calls & replies to NTP pool addresses, and I'm trying to track down the device/client on my network to point them to a closer clock.

Sure you can

man ntp and /etc/ntp.conf is your friend