I'm looking at my files now. Ch.1 65kb, ch2.46.5kb, ch3. 55kb, ch.4 66kb. They may not be to far from each other in length but I certainly don't try to keep them a certain length. Though I agree if chapter 1 is 65kb than it would be hard to carry a story, if the following chapter is 10kb. I've found myself going back and adding more description to my story in an attempt to try and match the length of the previous chapters having realized that my chapter is to short but I think it's up to the author to decide what's too short or too long.