The dark-blue columns show the statutory minimum number of paid vacation days. The light-blue lines show national paid holidays. The zero at the far-right-side for either one is the United States.
Ray, Sanes, and Schmitt sum it up this way:
"The United States is the only advanced economy in the world that does not guarantee its workers paid vacation. European countries establish legal rights to at least 20 days of paid vacation per year, with legal requirements of 25 and even 30 or more days in some countries. Australia and New Zealand both require employers to grant at least 20 vacation days per year; Canada and Japan mandate at least 10 paid days off. The gap between paid time off in the United States and the rest of the world is even larger if we include legally mandated paid holidays, where the United States offers none, but most of the rest of the world's rich countries offer at least six paid holidays per year."
"In the absence of government standards, almost one in four Americans has no paid vacation (23 percent) and no paid holidays (23 percent). According to government survey data, the average worker in the private sector in the United States receives only about ten days of paid vacation and about six paid holidays per year: less than the minimum legal standard set in the rest of world's rich economies excluding Japan (which guarantees only 10 paid vacation days and requires no paid holidays). The paid vacation and paid holidays that employers do make available are distributed unequally. According to the same government survey data, only half of low-wage workers (bottom fourth of earners) have any paid vacation (49 percent), compared to 90 percent of high-wage workers (top fourth of earners)."
In my Principles of Economics textbook, I include a little table comparing average annual hours worked across countries, based on OECD data. Here's the figure with 2011 data (with thanks to Dianna Amasino):
Of course, more vacation time is not a free lunch. One reason why per capita GDP is lower in these other high income countries than in the United States is the average U.S. worker spends more hours on the job. There are political economy issues, too: it makes my economist's skin crawl to imagine Congress and a president happily handing out paid vacation days to all, with little concern for the tradeoffs. But on the other side, it's also true that many of the rules that govern employment, and vacation time, are based in tradition and an implicit agreement about what a "job" will mean, not the result of a free-form multidimensional negotiation between employers and potential employees. It can be quite difficult for an individual, especially one seeking a low-skilled job, to negotiate even for flexible hours, much less for paid vacation or company-paid health insurance.
As an American, the idea of a legal right to paid vacation is gap in hours worked is outside my personal experience. I am honestly not sure that I would be emotionally comfortable cutting my workload by, say, six or seven weeks per year. It feels to me as if such a change would reshape my personal relationship to work in ways that I cannot really anticipate. But I wouldn't mind seeing the federal government add a few more national holidays. Most employers would treat them as vacation, and accommodate without much trouble. School districts would do the same, allowing families to plan some time together. And many workers who don't get the day off would at least get a pay boost if they end up working on a federal holiday.