At my hospital, all new employees are on a probationary period of 90 days with no days off. After 1 year, you are given 1 week off for vacation and 2 floating holidays. After 2 years, it is 2 weeks with 3 floating holidays. Once you reach 5 years, you can earn up to 3 weeks of vacation days/year and 6 floating holidays. Our maximum vacation accumulation is 6 weeks and then you will loose hours if you do not take time off.
As stated by @happy1, it will depend upon where you work and how many years of seniority you have.