What's the longest your infant has gone without pooping?

We're going on six days over here and it's unchartered territory for me! DS seems happy and content and I don't think he's constipated. But the anticipation of the coming poop-losion is making me nervous! DS1 was a clockwork 1x a day (if not more) pooper, even though they're both breastfed so this is def first-time ??? for me!