2) I don't think it syncs frequently during the session at all, it just syncs when commanded. But you can add, for example, this kind of line to your S:user-network-startup file:
Run >NIL: WaitX M=60 ALWAYS CMDLINE "C:SetClockNTP"
Replace the minute value for the M argument for what you feel is required. Or use H= for hours. Then it repeatedly syncs the clock in the background.
Thanks, just what I was looking for.