The amount of time parents spend caring for their children has been steadily rising since the 1970s. Yet many report feeling guilty for not spending more time with their kids. One group of sociologists, including Bradford Wilcox, director of the National Marriage Project at the University of Virginia, wondered: Is more time actually better? And the answer surprised them. According to their new study, the number of hours spent with a parent had no impact on how a child turned out, upending long-held beliefs about what’s best for our kids. But that’s not the whole picture. Existing r...