I've used several methods, but not happy with any of them I used to keep a series of post-ums, and then notes thumb tacked to a story board. One per chapter. Neither worked well. I now keep a doc file just for timing, to keep track of the days, and a brief paragraph about every chapter. Without this, I once had the characters go to lunch twice in the same day. At times, I have the plot advance far too much for a single day, and rewrite to add a day. Just wondering about other methods. I am more than willing to try another one.