I don't really know if similar question or concerns has been raised before, we often say that we are gamblers but does it mean that anyone who gambles once or twice is a gambler? If no, how long could someone be classified as a gambler or what games that are to be classified as someone gambling.
I believe there is no definite time period to make you called as a gambler. If you keep playing gambling games regularly, I think you can be categorized as a gambler. However, there are some types of gamblers. There are professional gamblers, seasonal gamblers, amateur gamblers, and many other type of gamblers.
So, the definition of who a gambler is has already explained it. Anyone that participates or that is participating on bets or wagering on football, horse race, blackjack, etc, such a person is a gambler.
Indeed. If we refer to the basic definition of "gambler", everyone involved in gambling can be categorized as gambler. No matter how many time and how often you gamble, you are a gambler. But if we define the gambler with our own view, the definition can be varied.