Everyone is talking about this like it didn't vary from century to century, or country to country.
The stat refers specifically to England in the 14th century and only covers work done for the landlord (mostly field work, which was hard labour, sometimes extremely long hours).
Did the fourteen century mark a great change from the thirteenth, or were conditions largely the same throughout the general era?
Massively different. The 14th century saw the death of over half the population by Plague, and then another 20%. That meant a HUGE labour shortage, higher wages by a large amount and "unhappy" landowners and the immediate end of the 100 year war with France. It also hugely increased mobility for peasants, since the receiving nobility would happily accept them (despite technically being allowed to).
It resulted in the Peasants revolt in the 1380s which saw the tower of London sacked before it was suppressed. So landowners had a lot of reasons to keep the peasants at least moderately happy.
So the late 14th century Britain was basically a worker paradise compared to the rest of the middle ages. But only because a good 75% of the population died from disease and famine in the decades before.
@unfreeradical sorry, I can't cite any sources. I read around this subject the first time I saw this meme, because I was curious as the people who are usually cited as doing less total work than us are hunter-gatherers.
Here are a couple of pages about types of peasant, work, etc.
If you're saying this because you disagree and have sources of your own to recommend, please do as I'm always open to learning more.