Focus...

“INTEREST. Here is the key to the whole thing. If and when you are truly interested in what you are doing, or are about to do, then you will center your attention on it with little or no effort, and almost irrespective of the attendant conditions.”
― Ralph Alfred Habas, The Art of Self-Control

My son painting a Space Marine for Warhammer, they're so tiny it takes much concentration, something he isn't that good at normally. With these, however he sat for hours.