I was at my cousin's over the weekend, and we canoed across the lake by their house, and my legs got direct exposure for about 5 hours. Second degree burns. If someone hit it, I would literally go into the fetal position and start crying.
It's only on the inside half of the lower half of my legs, or I'd be crying much more.
If I my legs are verticle, without moving, it starts to hurt almost unbearably. It's like my skin tightens up like a "skin-cramp" and then it feels like the skin is getting ripped from my lower legs. I can walk around, because it moves my legs, but I can't just stand up. If i'm standing, I have to be moving, or it starts to hurt after a couple seconds. I can't sit most of the time either. So, I have to be walking, or laying.