Three hours. Because I was near the end and I wanted to keep going. The draft is finished, but it's a bit minimal (it was written fairly quickly). However, that's often the case for me. I'm not a writer who overwrites by many thousand words and has to spend revision time cutting.
I tend to write lean and then build the characters and story up more in the revisions. Mainly, I wanted to get the plot right this time, and I still have some threads that need tying up.
That's a job for Day Seven, and the rest of the two hours will be rewriting on something else. Can't stop yet!