I have a character I'm developing who's background is about 4 pages long and growing. He's 257 years old, so I feel that justifies the length. However, I'm wondering if there's a point where someone should just say, "Okay. I've written enough, this character is developed enough, if not over-developed, I need to put my pencil down." Or do you feel that it's not possible for a character to be too developed.