400 Years
The gods did not turn my mind to stone. The punishment gets worse as every year passes by and I cannot break out of this body. This body is the prison for my mind. My mind is free to roam, to think, to imagine, to dream and yes, to scheme my way out of here.
The gods made a huge mistake there. They not only left my mind free, they also took their eyes off me. Those overconfident, arrogant bastards. They left me with 400 hundred years of solitude to sharpen my intellect.