Once you change your DNS nameservers, it will take anywhere between 12 to 24 hours for .com and .net domains, and between 24 and 72 hours (standard Internet propagation time) for all other general extensions for the update to be completed globally.
If after 36 hours from time of change, your domain is still not resolving on our network, please feel free to submit a trouble ticket. At that time, please inform us as to what domain registrar you submitted the change and what the time/date it was changed.