Well, I didn't quite cut it in half.
I write in an HTML editor, so that my chapters are ready to post without worrying about any conversion errors gumming up the formatting. As I write, I keep an eye on the file size, and generally try to keep them about uniform. The problem with HTML is that file size is not always a good indicator of word count. Lots of short sentences in a chapter can result in a file the same size as one with many paragraphs, but the word count will be totally different.
So it wasn't quite cut in half. The last chapter will be a little shorter.