It is totally individual. I've done 1,200 T-enth, 800-1,000 Deca a week and 25-37.5 Reforvit (liquid dbol) a day and more with no estrogen control whatsoever and had no symptoms. Other guys I know will get gyno symptoms from freekin' andro. However, I agree with the previous post that 300 a week of Deca should not generally pose a significant conversion risk. If you have ANY symptoms, hit the Nolvadex like mad. Good luck.