There is no ideal length, but you develop a little interior gauge that tells you whether or not you're supporting the house or detracting from it. When a piece gets too long, the tension goes out of it. That word—tension—has an animal insistence for me. A piece of writing rises and falls with tension. The writer holds one end of the rope and the reader holds the other end—is the rope slack, or is it tight? Does it matter to the reader what the next sentence is going to be? - John Jeremiah Sullivan