Cherwell District has been placed fifth in a study measuring average working hours across UK areas.
Employees there work 35.2 hours per week on average, representing 7.3 per cent more time than the national average.
The research was carried out by Re-flow Field Management using 2025 Office for National Statistics data.
It assessed the mean number of hours worked each week to establish which areas recorded the longest working patterns.
According to Ashley Wing, Re-flow Field Management’s chief marketing officer, substantial variation between areas is likely to reflect differences in local labour markets rather than disparities in individual effort.
Wing said areas near the top of the table tend to have larger concentrations of full-time, office-based and professional employment.
Longer contractual hours and unpaid overtime are also more prevalent in commuter hubs and major employment centres.
Cherwell has an estimated 75,000 jobs, with the local workforce contributing 2.64 million hours of work every week.
That average places the district immediately below Stevenage, which ranked fourth with 35.5 hours, and above Kensington and Chelsea in sixth with 35 hours.
Slough led the ranking at 35.9 hours per week, almost 10 per cent above the UK average.
South Holland in Lincolnshire and Rutland occupied the next two positions, second and third respectively, both recording 35.7 hours.
Moray, in Scotland, recorded the lowest mean at 30.1 hours each week.
Wing said the findings demonstrate how the characteristics of regional employment markets influence working patterns across the country.