As far as the word count is concerned, chapter 20 is nearly half done. I think this may end up being the longest chapter in the story though (can it be longer than chapter 3?) since I am definitely not half done with the content that 20 needs to have. My goal is to reach a very specific point with 20, to go into Book 6 with all gears turning, with the plot spiraling into the climax. The aim is then to have the major action finished by 22, leaving two chapters for epilogue, for a total of 24 (and the original story had 25 chapters... huh!).