hey good luck learning windmills. remember, if you don't practice, you won't get mills. i'm not sure how long it took me. i was playing around with mills for the first 2 months of bboying. (not practicing seriously) Then I started learning windmills seriously. After about 2 months. I quit for a while. 3 months later I started learing them again. After 3 months I finally learnied mills. It took me the average 5 months of practicing SERIOUSLY. If you are lucky, you could learn them in a week like wonderkid Bboy Marco.

I recommend practicing for 30 minutes to 1 hour a day.