OK, at 12 weeks, yer shut down right? Now why is it generally not a good idea to run the cycle for another.....lets say 4 weeks? How is it harder to PCT after 16 weeks than it is 12 weeks? I know it differs from person to person as far as how well/quickly one recovers but, generally speaking. What specific reasoning is behind the idea that "Most cycles should be ran no more than 12 weeks" (Which is what I have become familiar with for some reason).