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I believe it is actaully 90 minutes. Gatorade of course won't tell you that, but really you don't need more than water untill 90 minutes of constant exercise because you don't really lose that many electrolytes. However, everyone is different. Some people feel effects that aren't proven by science, but if it works for you it works for you and thats what matters.
Well if you are sweating you need to drink fluids to replenish what you are losing. 100 degrees in the shade is bad.
In 100 degree weather, I'm wiping the sweat off me with my MF towels every 10 seconds.
100 degrees in the shade with a black car is the pits. Don't recommend it at all.
I can attest to that! I love how great my car looks after I detail it, but I hate how sweaty I get. I usually go through a couple of large plastic cups of water with plenty of ice.