Worked Hours (Ref. Married Women)

Relying on three micro data sets, we document average hours worked of different demographic subgroups for a sample of eighteen European countries and the US over the period 2001 to 2008. We find that hours worked vary significantly across countries, and the largest variations can be found for married women: while US married women work 1250 hours annually, Italian married women only work 720 hours, i.e. barely 58 percent of their American counterparts.

That is from Bick and Fuchs-Schündeln (August 2012). 

The authors add:

. . . [T]axes and wages can account for three quarters of the large hours difference between the Western European countries and the US.

HT: Clarence Tsimpo.