When I was growing up my father worked 50-80 hours a week (in the 60-70 range most weeks) and my mother worked 24, so she did more of the housework.

When I was in my early 20s I lived with a boyfriend and we both worked 40-45 hours a week, but we lived right across the street from my job and he had to commute 30-90 minutes each way for his, depending on which sites he had to work at. I did more of the cooking because I spent more time at home.

Sometimes having one person do more of the housework is a fair arrangement in a partnership.