Most people ask this too early
People who search this have usually been trading for a while. A few trades made money. A few lost. And then a thought turns up: if I did this full-time, maybe it would go better.
The assumption underneath is that you are not doing well because you do not have enough time.
Going full-time does not make you trade better. It only makes you trade more.
The longer you watch, the easier it is for emotion to carry you along. That has nothing to do with the number of hours — someone watching eight hours a day is not calmer than someone watching one.