Wahine,

I beleive that they DO run 24hr Road events. you should look into it. I was thinking about trying one this season but it didn't work out (silly work gets in the way).

Electrolytes seem fine. I went for a few mtb rides on the w/e with no issues (I always take electrolytes pre-ride though) and did an easy run last night with no issues. The only thing I noticed yesterday was that I got the goosebumps on my run (which was maybe 45 minutes long) -- but it was 95F outside.