YORKSHIRE workers will put in more than £1.6m of unpaid overtime this year, said a report today.
Almost 400,000 people in the region undertake unpaid overtime for their employers, said the report by the TUC.
The average worker in the region logs more than seven-and-a-half hours a week in unpaid overtime - effectively gifting their employers an extra days' work.
Over a year, the average worker in the region does unpaid overtime which would cost his or her employer £4,264 at average hourly rates.
Nationally, workers will put in more than £23bn of unpaid overtime this year, the report said.
Managers, professionals, office workers and machinery operators are the most likely to do unpaid overtime.
The TUC has launched an online calculator which will show people how many hours they should work and how much they were missing out on if they put in unpaid overtime.
TUC general secretary Brendan Barber, said the figures confirmed that Britons worked the longest hours in Europe.
He added: "Given that workers in much of the rest of Europe work fewer hours, yet produce and earn more, are there not hard questions to ask about the quality of UK managers?"
John Cridland, deputy director general of the CBI, said the TUC had painted a "skewed" picture on employee attitudes to working time.
He said: "The unions not only dislike unpaid overtime, they also want to limit paid overtime by removing the right to opt out of the working time directive.
"Most people do extra hours because they want to."