And, of course, if we factor in the gender pay gap, which means women effectively work for free from the 9th November every year, it means that – really – we are working, on average- for free from around the 27th July.

It doesn’t bear thinking about.

Londoners are suffering the most, working around 8.9 hours unpaid every week, compared with those in the North of England and the Midlands, working 8.1 hours extra.

“We all want to do a good job when we’re at work, but there’s a line that it seems many of us cross where we’re giving our employers more time than we’re actually getting paid for,” says Joe Gardiner from TotallyMoney.com.

You might not mind working those extra 20 minutes, but TotallyMoney.com have created an Overtime Calculator that will probably change your mind. If you enter your annual salary in and the number of minutes each day you work after paid hours, it calculates how much money you’re losing every year.

Looks like it might be time to ask for a pay rise…

Calculate your overtime loss below:

Brits work the equivalent of nine weeks' unpaid overtime every year