You spend all day looking at the screen, you're more likely to make impulsive decisions. So what i've noticed is the more you limit yourself to the trades that you take to the time that you spend looking at the screen. The more you limit yourself to the amount of trades period that you take the better, because the more selective that you choose to be. You tend to be, therefore more calculated with those traits right, because, if you're limited, if we were to tell you hey, you can only spend two hours every day trading max.
You would try to make the most out of those two hours make it happen. If anything plays out great and if not then move on to the next day, because tomorrow then you're given another two hours.