http://www.adobe.com/au/products/creativecloud/faq.html
Do I need ongoing Internet access to use my Creative Suite applications?
Because your Creative Suite applications are installed directly on your computer, you will not need an ongoing Internet connection to use them on a daily basis. However, you will need to be online when you install and license your software, and at least once every 30 days thereafter. The software will alert you when you need to connect to the Internet for a license status check.