The subreddit antiwork recently posted a meme claiming that Medieval peasants had at least 150 days off of work a year. How true is this and did they get any days off?

In addition the a great explanation of the origin and background of the claim provided by u/AdmiralAkbar1 you might be interested in my two entries on that topic that cover more detailed presentation of the differences between the idea of labour in Middle Ages and today, as well as the actual number of holidays in a liturgical year.