Basically, I remember reading that after torturing a character to much after a certain limit, not sure what, the audience becomes de-sensitized to the pain of the character, whether that is physical or emotional. So... what is that limit? Does it really exist? Or is it all dependent on how well you write what the character goes through? The reason I ask this is because of my attempts to write a horror story, which involves the protagonist being tortured either physically or psychologically for large chunks of it.