Winny and var should be ran from 6-8 weeks if you really want to enjoy the effects. Both compounds take a few weeks to really kick in so if you stopped at four weeks, you'd really only be getting a week of seeing what the stuff can do. I personally prefer 80mg if using var, however, I'm not prone to hair loss so I go with winny every time now. Winny definitely gets you much drier than var.