by Hoffmaster » Aug 11 2008 4:15 pm
Like anything physical, it depends on your fitness level. I wouldn't be surprised though, if you were to reach the rim by noon. With summer time temps what they are at the Canyon, you should hope you reach the rim well before that. Temps go down as you go up, but it's still hot.
"I'm not a vegetarian because I love animals; I'm a vegetarian because I hate plants." A. Whitney Brown