If you really don't really need the extra custies, then take some time out for yourself and your family
Wise words, I've got three kids, and I enjoy being with them, I could work 6 days a week but why?
I work 4 long days (usually 11 hours or so) and always take Friday off, go out with the missus, pick up the kids from school, who could ask for more?
Once you have earned what you need plus a bit for emergencies earning more and more won't do you much good.
Quality of life, worth all the money in the world.