I have been writing a little bit every day this week. 400-800 words usually. Today is Saturday and I woke up and have been working on it for several hours and I'm making great progress. I reached the REAL 50,000 words mark a little while ago!
I've got a couple thousand words to go on the climax, and maybe another for the wrap-up at the end. If I don't get too many interruptions I could probably finish the rough draft by the end of today or tomorrow!
I gave myself a forced deadline by entering the book in a contest that requires a 50K book by March 4th. That doesn't give me nearly as long as I should probably take on edits, but it's giving me the motivation I need to soldier through these last chapters and get the book sent out. I should hopefully have time for a first round of edits before the submission deadline. I still don't know exactly how it's going to end, but by this time tomorrow night I will. It's very exciting to be so close. :)