Well, the door locks have been finished. That happened much sooner than I was anticipating! We'll have plenty of time to do some more NPC polishing this month now!
I've been thinking that if I finish all of my goals for one month, I will cut the remaining days of the month in half and take that long of a break before beginning work on the next month. I think that's a good way to do it and incentivize finishing things faster to take longer breaks.
If I actually get to the point where I'm finishing things way before the end of the month and very frequently, though, I'll definitely want to just keep working on stuff so I can get the game finished! I definitely don't want to keep anyone waiting, much less myself, but it is still important to take breaks every now and then.