Humorous Probability

[AviD]

Amidst my few years of playing now, I have never got a single Royal Flush. My friends and I jest about this sometimes...especially when one of them hits one (again).

One friend in particular must have at least 20 of them in the same time frame as I've been playing and over nearly the same number of hands.

What is the probability of getting a Royal Flush?
Over how many hands could one expect to get one?

Just for chits and giggles...we've already ascertained that I am the most unlucky SOB on the planet.
Some people run bad, some people run "AviD".


EDIT: Sorry as mentioned by a follow-up poster, I forgot to mention the game. It is Hold Em'.