New domains and changes to domains may take up to 4-8 hours for .COM and .NET domains and about 24-48 hours for all other domain extensions to become effective.
This is due to the number of networks involved, and the fact that those networks are controlled by several different agencies.
This delay applies to all domains and all Registrars. Please allow for this delay when planning Web sites or configuring a domain to work with your email.
More information about registering and managing domain names ...