Hey when I was 10 in 2004 I went swimming for 12 hours strait in a lake from 6am to 6pm. But the only thing I had to drink was a small cup of sunny D that morning with brekefest. I ended up getting 1st or 2nd degree sunburn and wet wax in my ear. My legs haven't burnt since that really bad sunburn. But it had felt like there was fire a inch away from my thighs at all times. But what I am wondering how badly dehydrated could I have been??? Oh and I had water restistance in stead of water proof suncreen not knowing the difference at the time.