I think most of us don't have 6 pups around at the same time. I had three litters a few months ago... total 11 pups... thought I was going to go insane!! The more pups the more mess!
My Pebbles had three pups a few days ago... and even though I have to feed the smallest one all day long... I feel way better (even without sleep) than I did when I had 11 pups.
Gotta love 'em!!