The last great unknown, in terms of physiological training, is the optimum length of a piece. Is three minutes enough? Is ten minutes too much? No one knows. Perhaps someday the question will be answered-we'll find out that thirteen minutes… — Brad Alan Lewis Copy Share Image
“If you really want to focus on something, says Castellanos, the optimum amount of time to spend on it is ninety minutes. "Then change tasks. And watch out for interruptions once you're really concentrating, because it will take you twenty… — Winifred Gallagher Copy Share Image
