Today is quite a milestone. I just passed 40,000 words and am well within my goal word count. Apparently the last 10,000 words are pretty much of a slide. I'm thinking about when I ran the Marine Corps Marathon in 1991, though. I finished off the first 20 miles and realized I had 10,000 meters to go, and thought how nice it would be to stop right then.
One difficulty is that I already know what the last two scenes in the book are going to be. So my options are starting to get limited for new scenes for my actors. But I've found finding that every aspect of this exercise so far has somehow made me squeeze out some new aspect of writing, and I expect that this restriction will make me do just that as well.