In 2002 both partners in 6.8 million households were working. For these people the issue of conjugal synchronisation, i.e. the degree of similarity of working hours amongst couples, is becoming increasingly crucial. In 1999, less than one in two working days was synchronised. This conflict in schedules has increased by 20% since the mid 1980s and mainly affects couples at the bottom-end of the social scale: individual inequalities are intensified for couples. Differences in working hours are the most common of such disparities.