"When you focus on frequency of learning versus duration or even intensity, you will learn better. Focusing on duration usually becomes motion for motion's sake, adn can oftentimes become detrimental overall to your goals."
It is what it sounds like—leaving time between practice sessions for the same material. You might call it deliberate not-practicing between bouts of deliberate practice. “There’s a limit to how long you should wait,” Kornell told me, “but it’s longer than people think. It could be anything, studying foreign language vocabulary or learning how to fly a plane, the harder it is, the more you learn.