When the novel is finished, you suddenly have all kinds of time on your hands. A whole new world of opportunities opens up to you. Midday naps are not out of the question. Grocery shopping is no longer optional. You can put out breakfast and lunch offerings in the morning, and even fold some laundry. Exercise becomes mandatory. Keeping "BUTT in CHAIR" is no longer an excuse for secretary spread. A trip out of town means more than a new venue for writing (hotel bed vs. hotel desk). When the kids tell you stuff, you remember. Meetings are attended, you sign up to help with things, you have time to work on lesson plans for your classes.
When the novel is finished, you suddenly have lots of time to start thinking about the next one.