Yes it is possible to make forex as a living, and about time required to make it as a living, it depends on the person
if he is a fast learner or not. But it will still take a long time, because you need to study a lot about forex, because forex is very big. And you must gain experience also in order to know your mistakes. And when time comes that you become a good trader, then you can make it a living. Just sitting in your house and clicking and earning so easily.