And with the Babette, some of the yarn is used to connect all those squares. Here's one that's made in one rectangle -
http://iamtotallyobsessedwithyarn.bl...-pictures.html - and though the original doesn't say how much was used, some of the projects on ravelry with only one or 2 colors were made from about 1000-1500 yards with an I or J hook. No sizes were given other than `throw' size.