How many hours should I have before entering nursing program?

Im looking to go into a Registered Nursing program in June of 2010. But right now I work at a hotel. I was wondering how many hours you should have logged as experience in the field before applying to the program? right now I have zero experience. But my grades are pretty good. Just let me know how many you had, or if you know what the average amount of experience time is. Thank you very much.