”She works hard for the money, so hard for it honey,” Donna Summer belted out in 1983. She was referring to ordinary women, but how hard do the royals work?

According to Danish Ekstrabladet, Prince Charles and his mother, Queen Elizabeth, are the hardest working royals. But Swedish King Carl XVI Gustaf and Queen Silvia aren’t far behind. The least working royal is Norwegian princess Märtha Louise.

During the period January 1 to December 16 in 2013, Prince Charles (who is 65 years old) worked 189 days, his mother, the 87-year old British Queen, worked 181 days, King Carl XVI Gustaf (67 years old) worked 168 days, Queen Margrethe of Denmark (73 years old) worked 124 days, England’s Prince Philip (92 years old) worked 120 days, and Queen Silvia (70) worked 134 days, Crown Princess Victoria (36), worked 89 days, her husband 40-year old Prince Daniel, worked 89 days also, and her younger brother Prince Carl Philip (34) worked 53 days, while Princess Madeleine, who is 31 years old, worked 22 days which is next to the ..well, laziest royal: Princess Märtha Louise who worked approximately 12 days.