That was interesting. I have written 16 books, but writing has always been a sideline for me, something that is really recreational. I write in variable blocks of time and simply quit when I want.

+1 on the recommendation to use a pad of paper. I write non-fiction (hopefully :-) but I use the blog author's time away from the computer technique all the time. It really saves time in the long run to have an overview before writing a book chapter. [Same technique works for programming also: it is a real mistake to not spend time aways from a computer, with a pad of paper, planning work.]