America: the land of the overworked.Alexander Spatari/Getty Images The US has the fewest paid leave days and the second-lowest number of paid vacation days in the world. It's the only developed country in the world with no statutory paid leave. Iran has the most public holidays in the world and the most paid vacation days overall. With ten paid vacation days and zero paid leave days, the US — dubbed the "no-vacation nation" — has the world's least paid leave.