In Marianne Kinzel's First Book of Modern Lace Knitting, I've seen a couple of patterns that interest me but I would knit them in laceweight wool, not cotton. The patterns call for x balls of Crochet Cotton No 60. My problem is that I can't find out the length of one of these balls to to get an appropriate number of metres/yards of wool. I've Googled, I've spoken to my LYS but can't find out the length. Does anyone out there know?