The average employee in Wales works an extra 6.2 hours per week - adding up to an extra £735m-worth of value to the Welsh economy.
"That's a huge amount of hours," said Rhianydd Wiliams from Wales TUC.
"We're asking employers to recognise these extra hours and maybe looking at better ways of managing time within the office so that people feel they can leave on time or have a proper lunch break."
More top news
Rhyl FC are looking to the future after signing up manager Niall McGuinness' son, Lucas following his birth on Monday.
Only three quarters of patients are seen with four hours a Wales' major A&E units. The Welsh Government target is 95 per cent.
New captain Alun Wyn Jones in England icons Martin Johnson and Lawrence Dallaglio's class, says coach Sean Edwards.