The lease on static IP addresses continues until you either choose to delete them from your account, or until you cancel your CenturyLink Internet service.
Only one domain name can be assigned to a specific IP address. For example, ftp.mycompany.com and www.mycompany.com are considered one domain name. This is only applicable to qwestoffice.net customers.
However, www.yourcompany.com and www.mycompany.com are considered two separate domain names and both could not be assigned to the same static IP address. This is only applicable to qwestoffice.net customers.
Note that moving or upgrading your service will usually require a change to your static IP address.