I'm not as good as I used to be, frankly because I got lazy, but when I was having a vivid lucid almost everyday of the week for about a month or so, I was doing between 6-10 at random, even now I still get a good lucid now and then and the past couple weeks I've been doing between 1 and 5 (these are rough estimates). All of my RC's are done impulsively and if no strange situation arises, they're done randomly.