Here is more detailed information about the yarn requirements:

Number of skeins in the suggested yarn for each size:
3 (4, 4, 4, 4, 5, 5, 5)

Where each skein is 500 yards.

I do not have more specific estimates by size, and gauge can strongly impact the yardage required if you substitute - I have no way of knowing how much of a different yarn you might need.