A judge will consider all factors. The judge must make the determination for custody based on the best interests and welfare of the child. Every case is different, so your situation may require the judge to consider something as remote as your work hours.  In other cases, the judge may focus more on a party's previous history of serving as a homemaker and primary caretaker of the children.  You should consult with an experienced family law attorney to explore all the facts of your case and the particular strategy which that lawyer thinks will enhance your argument.