I will be reintroducing mine to my subject. Like jj said, ergo's will last two months. I used at 10mgs for a few weeks to 3 weeks, took some time off, and ill be going back on at 5mgs daily.
My subject noticed too much fat loss at 10mgs per day. So 5mgs for him now on. But thats because he was in the offseason and he just was trying to keep the fat down while bulking, not get shredded for a competition