It is established that bronzed villains are still conscious and experience the time they are bronzed. Most bronzed villains we see on screen are in this state 100 years or more.
While one could argue that those villains are already mad and insane even before bronzing, I think it is surprising that they aren't completely insane babbling idiots when they become debronzed in the end. Being an evil genius who want's to control or destroy the world does not automatically protect from going insane after 100 years of locked in live I think.
Examples:
H.G. seems to be more or less sane after debronzing.
The alchemist behaves like if he awakes after a good long sleep.
EDIT:
It seems there is no answer and my assumptions are not so broadly accepted as I thought, so I will close this. Ok, deleting an answered question seems not to be the good way here. I think the answer is wrong, so what should I do with this question? Delete it anyway?