It seems that I reached that point on INSURGENTS yesterday, at 9000 words. Today's 1,000 words were effortless; I could see and hear what was going on in the chapter, and all I had to do was type at top speed trying to get it all down. I love it when this starts to happen, not only because writing is no longer hard work, but also because writing in this mode seems to smooth out something in my brain. I become a nicer person, kind to children and small animals and actually willing to cook for the First Reader. I shouldn't be surprised if this actually alters something in my brain chemistry, generating endorphins like exercise or playing chamber music.
This shift is also why I had to have a sitter when the children were small. I'm really not safe to watch over small children in this mode, because I stop hearing and seeing what's going on in the outside world.
There's a temptation to go on and shoot for 2,000 or 3,000 or more words. I've done that in the past, when faced with deadlines, and it really doesn't work out very well for me. I can push it for maybe a week, but then I pay the price with several days of staring at the air and feeling like a total idiot whose brains have just been scooped out with a spoon. It seems my personal story-generating mechanism works at a rate of 1,000 words/day and that's that; if I speed up one week, I stop altogether the next week, so I'm not really that far ahead. And before anybody says, "But look at John Ringo," I would like to point out that I don't have the use of John Ringo's brain and his inexhaustible, high-speed story generator.
In any case - Hallelujah! Good Friday has been very good to me.