Here are some Gesture drawings I did. This kind of drawing studies I try to do at least 3 times a week! Of course there's not a formula to how many times you should do some kind of work, it all depends on the effort you put in each drawing you do, I've came to understand with the few experience I have, that it's not only how many drawings you do, but, how you do those drawings! what are you thinking at the moment, are you just putting random lines? are you just making copies? I've understood from not long ago that you should understand how to draw, rather than just copy what you see, this way I think you learn quite a lot more!