The scholars found that people underestimated how many ideas they could generate by persisting for that additional period of time. Moreover, outsiders judged the ideas generated after persisting as of higher quality than the ideas generated initially.
The study shows the value of persistence, but it also demonstrates that we sometimes downplay its importance. I think it's because we often think of creativity as a flash of brilliance. It's not. It's hard work! It takes time to reflect, think, make connections among disparate concepts, and synthesize ideas.