How many kilometers is your sweater?

I was having coffee with a friend the other day and I was telling him about starting this business, so he checked out the website on his phone. He doesn't knit or crochet and (by his own admission) doesn't really know anything about yarn. The thing that struck him the most? The yardage in a skein of lace weight yarn... 851 meters (931 yards)... almost a kilometer! I'd never thought about it in those terms before, but I guess that's why it takes so long (for me, anyway) to knit something with lace weight yarn, and why the skeins are so nice and puffy! 

Lavender in Lace

Poinsettia in Lace