This fall Spain plans to launch what will be the world's first national pilot program for a four-day workweek. The idea has gained popularity in recent years to encourage productivity, boost workers' mental health, and fight climate change (less commuting means less pollution). The pandemic, particularly with its stresses on mental well-being, has added urgency to the proposal. That's why other countries — especially those with strong labor protections and short workdays — are paying close attention to the experiment, under which the Spanish government will subsidize part of a company's cost to transition its employees to a four-day workweek. Here's a look at how long workers are generally on the job in other OECD countries (without accounting for paid leave in any of them).