I contacted Hogdgon shortly after Triple 7 came out and wondered if, since it was so much "cleaner", you could go longer without cleaning the gun. I was told "no" - they said the corrosive elements are still there, but with a lot less soot and black stuff.

I have left a stainless in-line gun sit for thee days after shooting it with no ill effects. It's pretty dry out here, though, so it might not be a good idea in a humid climate.