I've been on for over 20 months now, so that's 100 weeks, and I'm still gaining. What has become obvious to me is that gains stop because of other functons of your body, not because of the need to up the dose. I've been at a gram per week and at this point average about 1/2 pound a week, so around 2 pounds per month. I don't attribute this to the need to up my dose, but rather to the fact that I'm already 260 pounds. My metabolism has sped up so much that it is now very hard to out eat it....economically and physically. Most people gains stop at 10 weeks or whatever because they don't change anything as far as diet, training, and recovery that they had in place at the begining of thier cycle. It becomes more and more important to have constant variety as you progress with your gains. The bigger you get the more you have to eat, but most people don't increase thier food intake incrimentaly throughout thier cycles, nor do they alter thier training. Also, the more muscle you acumulate the more rest you need. I need a nap or two every day along wiht 8-9 hours per night to fully recover. Bear in mind that carrying a lot of muscle is physically and nuerologically demanding in itself. Trying to gain even more on top of that stress is very demanding of the body. I see no need for you not to be able to gain for 20 weeks. It will slow down as you grow, and at that point you will have to get creative and even more dedicated about continuing growth. A lot of people give up when they see the scale or measurements stop moving. Refuse to give up and you'll grow.