Hmm, well I normally do it a lot... because I am not having regular sex since my fiance is out of the country in the moment. So I would say about once a day, sometimes more depending on how I am feeling.
Here's an interesting question- did you all always masturbate, or was it something you learned later in life?
For me, I never did until I was older and trying to figure out how to have a good sex life. Oh, sure, there were times I did (sort of) as a kid, but that never really worked all that well. It wasn't until I was older that I figured it out.