I would take a 10 hour day in almost any job in the 21st century over an 8-16 hour workday for a 14th century farm laborer mowing hay with a scythe or plowing behind a team of oxen. I get meal and rest breaks too, and even though they may get more days off than I do, what are they doing on those days off? Chopping wood? Thatching their roof? Hauling water from a well? The amount of labor done in a day by peasants in the European middle ages dwarfs everything but the extreme outliers of today.