Most people are unable to sustain attention on one thing for more than about 40 minutes at a time, so sooner or later, you will lose focus. But people who have great focus realize when they get off track and choose repeatedly to re-focus on the same task. This ability to renew attention permits people to “pay attention” to things that last for more than a few minutes, such as long movies. So improving your attention span becomes a cycle of focus, distraction, and REfocus.