Although many people think that they work so hard and so long that they're practically working for nothing, British Airways has reportedly asked its employees to work for free. Well, technically they are offering associates up to 4 weeks of unpaid leave (or the opportunity to work for free). Unlikely that anyone will work take the work for no wage option, but unpaid leave, if you can swing it financially, offers some unexpected freedom that you might not normally get working full time.
I don't know about other countries, but I know where I work we can't allow our employees to work off the clock for fifteen minutes, much less 4 weeks.
It's a good question to ponder. If your employer told you that you were going to have the month of August off as unpaid leave, what would you do with the time?