The 52/17 Rule

This one came from a company's own data rather than research. In 2014 the time-tracking company DeskTime looked at the top 10% of its most productive users and found a common pattern of about 52 minutes of work followed by a 17-minute break. It is not a peer-reviewed or controlled study, and when DeskTime repeated the analysis in 2021 the pattern had stretched to 112 minutes of work and a 26-minute break. Treat it as permission rather than a rule: longer blocks with a proper rest can suit an evening better than chopped-up 25-minute rounds, especially if you need a real break after a full workday. Two cycles fill an evening of just over two hours.