| ha!ha!ha! I hadn't really thought about the bioweapons angle. You are right though - I never realized either how much of this stuff there is out there. It's everywhere. If the plant had a brain and opposible thumbs we'd be in trouble :-)
Anyway to answer you question - well it varies. Not exactly what you're looking for. The average is 10-14 days with some people less and some people more. Keeping the rash clean and dry and not scratching it will go a long way to shortening the duration. Also - keep the stress level down - I just finished reading about how the body releases histamines into the skin which can cause additional itching. Here's an interesing read: Stress & Skin
I think my last round of poison ivy lasted about 7 days or so. I have had rounds though that went 3 weeks. Just depends. | 
