This really only applies to people who work full-time and who work in industries/services where it is feasible.
The Gambia has shortened the work week, making Friday a day of rest. Is this the perfect pattern for a working week?
In the tiny African nation of The Gambia, public sector workers will now clock in at 8am and clock out at 6pm, Monday to Thursday. They'll still do a 40-hour week but have the luxury of Friday off.
Rest of story here
In 2008, about 17,000 government officials in the US state of Utah started working four 10-hour days in a bid to cut costs. The experiment didn't last: the five-day week was reinstated in 2011.
Other US states have also toyed with the idea. Oregon and Texas legislators considered - but did not pass - four-day work week bills, while Georgia and Virginia have trialled it at a handful of agencies.
The four-day week is also popular in the Netherlands, where one in three men either works part-time or 40 hours in four days. In the UK, certain professions - journalists among them - have often worked a four-day week of longer shifts.
In Australia the standard working week is 38 hours so the 4 day working day would only be 9 1/2 hours long not 10 hours long.