Sure I've had 3 jobs at one time but this Yang guy beats me easily

[theking]

...in regards to total work hours per shift... :

Chinese father-of-2 works 19-hour shifts to help 7 additional children from struggling families

Yang Jun, a 35-year-old man from Fuyang, Anhui Province, in eastern China, reportedly works as a decoration employee during the day and a chauffeur at night to fund seven children from struggling families. Yang typically works until between midnight to 3 a.m. and purportedly sleeps for less than five hours a day.

...In addition to the seven children and their families, Yang also supports his wife and two young children. Although his wife expresses relentless support for her husband’s good deeds, Yang explained that she occasionally tells him that “you treat other people’s children better than your own.”