Greets!

Ok.  I'm looking at a client that needs to keep their server time close as reasonably possible (within a minute) of the actual time of day.  I've installed the RPM for NTP and I'm looking for tips on what the simplest setup should be, ie:
What server(s) should I be using for sync?
Should I just run it from a cron every 20 minutes or so?

thx.
Mike