How long must a person play video games to be considered a "Gamer"?

Originally, the term "gamer" referred to someone devoting a lot of time to role-playing games. However, in recent years the term has come to include video game players.

How many hours per day must a person play video games to be considered a "gamer"?

Also, how many days per week must be devoted to video game playing?

************************

Thanks in advance for your Answers.