How many people did you need to build a medieval cathedral?

The answer to the question I posed in the title of this post is, according to the author of a recent article on Medievalists.net, not what you might expect.

The evidence comes from the civic records of the city of Girona in Catalonia, and relates to the building in the fifteenth century of the nave of the cathedral. This was in itself a radical departure in its design from the choir and ambulatory erected at an earlier date.

The article can be read at How Many Workers Built a Medieval Cathedral?