How long on the internet is considered an addiction?

Going beyond limits. If you set limits like facebook 2 hours and going beyond your time limit and frequently violating your personal time limits is considered addiction - learn how to set limits at - http://outsmarter.Net/.
No set # of hours. There are no specific number of hours that define an addiction to the internet. Rather, the definition of an addiction is continuing doing something despite known adverse consequences. If the time you spend on the internet is causing physical or emotional problems, or is harming a relationship that is important to you, and you cannot stop doing it, then you may be addicted.