I am into my 5th week of anavar (55mg ED), winny (50mg ED), and primo (400mg/ week). I have been taking 500mg of milk thistle ED. Strong as hell, but still soft around my waist. I am going to run the anavar and winny 8 weeks and the primo 10 weeks. No sides that I can see, but have know idea what I am doing to my liver!
I say six weeks maximum. I peaked out in terms of gains in the fourth week. I think you will have much better results doing two four week cycles with same time or more off in between.