So as of this morning, I am officially behind schedule--but not by much. I worked out the math last spring and figured I would need to average 550 words per day to complete the book, at my word-count target of 150k words, by the end of the year.
I just noticed this morning that my average daily word count now needs to be 558 if I am still going to reach that goal. I had previously seen the required number drop as low as 523, when I was ahead of schedule a couple of months ago.
So what does all this mean? Not much, really. I spent the last couple of weeks pretty focused on the Pathfinder Playtest, reading the rules, rolling up sample characters, and learning the system. My gaming group will be starting the playtest this week, but that shouldn't impact my ability to keep working on the book (we were already playing a weekly Pathfinder game anyway).
So yeah, I'm a bit behind schedule, but not really worried about it at this point. I'll just write a few extra words each day, and eventually get caught up, or maybe even get ahead of schedule like I was back in June.