[e2e] Accuracy achievable with NTP

[Woojune Kim]

Hi,

I've been looking for info on how accurate NTP can be. I've looked in various NTP related sites and still not quite sure.

Say I have a LAN like environment with delays in the range of 10s of ms. How accurate a time can I get from NTP, assuming I have the appropriate HW clocks on my host ?

Say I have a corporate network like environment, relatively segregated from the Internet at large, with delays in the range of 100ms. How accurate a time can I get ? 

Say the delay range goes upto 500ms, how accurate can the time be ? 

Any pointers to specific experiments or data would be appreciated.

thanks

Woojune Kim