A worker did 7.7 hours of unpaid overtime per week, on average in the South East, according to the Trades Union Congress (TUC).
A TUC spokesman said its analysis had revealed 860,000 people in the region were not paid £6,430 each for working beyond their contracted hours in 2015.
Across the country, the most unpaid overtime was done by teachers and education professionals (with more than half of them working an average of 11.9 hours unpaid every week), followed by financial institution managers (11.2 hours), production managers (10.3 hours), functional managers such as financial, marketing, personnel managers (10.1 hours), and managers in health and care services (9.9 hours).
People aged 40 to 44 were most likely to do unpaid overtime, with more than one in four (26.9 per cent) in this age group putting in unpaid hours compared to an average of one in five (19.4 per cent) for all UK workers.
TUC Regional Secretary Megan Dobney said: “Too many workplaces in the South East tolerate a long-hours culture.”
He said it was “too easy for extra time to be taken for granted and expected day in day out”.
HE urged people worried about a long-hours culture in their workplace to join their union.
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