My chapters range from 2,000 words to sometimes over 8,000! I just keep going until it seems like a good place to stop. Since I tend to make up a story as I go along, I never can tell how many chapters I will end up with. I do like to end it on an even number though. My very fist fic was 35 chapters long but only 60,000 some words long. The moster one I just recently finished this summer was over 200,000 words long but only 28 chapters in length.