If downloading papers from Springer = working then this paper by Wang et al has fascinating evidence on when researchers are working around the world. They got several days data on downloads of academic articles from Springer by location and time of day and composed download curves across the day for both weekdays and the weekend. Most of the cultural stereotypes hold up - late lunch in Spain and almost no lunch break in the US and UK. Australians tend to have a more defined workday than other English speakers. Americans, Chinese, and British work particularly hard at the weekend compared to other countries.