[ntp:questions] How often should server hop happen?

[David J Taylor]

I know it's like asking how long is a piece of string, but how often would 
you expect server change to happen?

I.e. an NTP client with say 5 servers in its list.  Would you expect it to 
change server serveral times an hour, several times a day or what?  I'm 
seeing several times an hour and wonder if I should put in a "prefer" 
qualifier to reduce this.  I appreciate it does no harm, but it does 
rather clutter the Windows event log!

Thanks,
David