Mr. Burns: I'll keep it short and sweet. Family, religion, friendship. These are the three demons you must slay if you wish to succeed in business. When opportunity knocks, you don't want to be driving to a maternity hospital or sitting in some phony-baloney church. Or synagogue.
http://en.wikipedia.org/wiki/List_of_statutory_minimum_employment_leave_by_country
US law does not require employers to grant any vacation or holidays and about 25% of all employees receive no vacation time or holidays. For employees that do receive vacation, 10 working days with 8 national holidays is fairly standard. Members of the US Armed Services earn a total of 30 vacation days a year, not including national holidays.