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."
A civil servant, firefighter and teacher have embarked on a one hundred and fifty six mile walk from Cardiff to London to join the TUC rally against UK government cuts.
Cerith Griffiths, from the Fire Brigades Union, says he feels it's important to highlight the impact the cuts are having on the fire service.
The declaration by Shadow Finance Minister, Paul Davies AM that Welsh Conservatives want to 'put on record that (they) are against introducing a regional pay system in the United Kingdom' ends a level of uncertainty about the Assembly group's position which had previously been to express 'concerns.'
It means that both Welsh Liberal Democrats and Welsh Conservatives are opposed to a move which their parties in government at Westminster are moving towards. It also means that all four Welsh parties are on record opposing the introduction of regional pay.
Labour AM Mick Antoniw welcomes Plaid's opposition to regional pay but hits out at what he calls its 'bizarre' decision to call for pay and conditions to be devolved. He says that would require large amounts of new funding and compares it to Del Boy promising 'we'll all be millionaires tomorrow.'
Ahead of this afternoon's Assembly debate on regional pay, Welsh Liberal Democrat AM Peter Black has said introducing it would be 'disastrous for Welsh workers and the Welsh economy.' He said,