Japanese fathers spend an average of 3.1 hours per weekday with their children, placing second from the bottom in a six-country international comparison, according to a report by the National Women's Education Center.

South Korean fathers spend the least time with their children out of the six countries polled, at only 2.8 hours per weekday.

Japanese fathers average the longest working hours, at 48.9 hours a week, followed by South Koreans at 48.8 hours. Swedish fathers, by contrast, put in an average of only 37.7 hours per week.