Barclays Bank told thousands of staff in November 2026 that they must now be in the office at least three days a week, up from two, joining a wave of employers tightening hybrid work rules. The move comes just as a growing body of research suggests the opposite direction is the wiser one: two or three coordinated days in the office, and no more, keeps staff happier without costing performance.
The evidence, laid out in an analysis by Umar Boodoo, an associate professor at Warwick Business School, and published by RTE.ie, points to a simple conclusion. There is no single magic number of office days, but the sweet spot is two or three, on the same days as your colleagues, with office time reserved for the work that genuinely benefits from a shared room.
What the research actually found
The strongest evidence comes from a large experiment at an online travel agency in China, where more than 1,500 engineers, marketing and finance staff were allowed to work from home on Wednesdays and Fridays while a control group stayed in full time. Over two years of performance reviews, the hybrid workers matched the quality of their office-based colleagues. They were also far less likely to resign, with women and workers facing long commutes showing the biggest drop in departures.
A smaller experiment at an international development organisation tested the question directly, randomly varying how many days 148 staff spent in the office. Those who came in around two days a week reported better work-life balance, more job satisfaction and less isolation than colleagues who came in more often or less often. Performance was unaffected either way.
The Conversation, which originally published the analysis, notes that the pattern holds across studies: a week split roughly half and half between home and office costs employers little while keeping staff happier and more likely to stay. But the office time still counts. Experiments across five countries found that video calls reduce the flow of creative ideas, and an analysis of 20 million research papers and four million patents found that remote teams were less likely to produce breakthroughs. Being in the same room matters most when people are generating ideas together.
Why more office days buy nothing
In the Chinese travel agency trial, staff who came in three days a week performed just as well as those in for five. The extra two days bought nothing measurable in performance. What they did buy was more resignations.
That finding lands hard against the current drift in corporate policy. There is a real risk, Boodoo argues, that return-to-office mandates set a minimum with no maximum, so the minimum quietly creeps up. A study of more than 1,000 UK managers found that employees working from home were less likely to be considered for promotion and pay rises. When simply being seen is what gets rewarded,