When Time No Longer Is Limited

On a regular day Simon, a first year in high school, mysteriously activates an ability that stops time. Simon is a guy that is all about using his time to the fullest. To him, this is the golden ticket to infinite productivity. But upon trying to activate again, Nothing happens. He doesn't even know how to do it. What does Simon have to do to activate the ability? And will he achieve his dream of infinite productivity?