Princeton research shows sustained focus tanks performance as your brain gets distracted. A 30% recovery break resets focus. The 3.3 rule: work up to three hours, then take a break equal to 30% of that time.
Chapters
So he wondered, does the same thing happen to our thoughts? Well, the Princeton Neuroscience Institute would say, we know it goes from focus to distractibility, and it follows that. So he did some studies and sure enough found out that sustained focus on a thought or work effort will neutralize the stimulus and performance significantly drops after a period of time. We can overcome that decline in performance by adding this 30% recovery period. The recovery period allows our brains to reset. It allows us to then come back to the work focused. When it comes to the 3.3 rule, again, the most efficient workday consists of up to 3 hours worked at a time followed by a 30% recovery period.