I did a double crossing of the Grand Canyon, from the South Rim to the North Rim and back again. This is about 47 miles, but there are only two hills ;}
The double crossing took about 14 hours, with temperatures ranging from freezing to horribly hot, but outstandingly beautiful. Preparation is key to this run, as you are self supported. It is also important to choose the time of year carefully and plan to be able to run on one of several days. Bad weather can make this trip dangerous! The main danger is the heat, which can be intense, especially if it is unseasonably hot. The other issue is with water. There are several water opportunities on the run, but the pipes fail quite often. You need to be able to postpone the run a day or more to allow for repair time.
You should read the article on running the double crossing in the April 2008 edition of Ultrarunning magazine.
This is the view back down the bright angel trail towards the Colorado River. The Bright Angel trail has several water stops; at Indian Gardens Campground, 3 miles below the rim and 1.5 miles below the rim. These last two are fed by a pipe which often breaks - I would not attempt this run without those water stops working. (They are only on in Summer, as are other water stops.)
This part of the trail is in shade from about 4:00 onwards; it is well worth timing things to be out of the sun. Ascending this trail with the sun on you after 40 odd miles would not be wise.

This is the view back down the bright angel trail towards the Colorado River. The Bright Angel trail has several water stops; at Indian Gardens Campground, 3 miles below the rim and 1.5 miles below the rim. These last two are fed by a pipe which often breaks - I would not attempt this run without those water stops working. (They are only on in Summer, as are other water stops.)
This part of the trail is in shade from about 4:00 onwards; it is well worth timing things to be out of the sun. Ascending this trail with the sun on you after 40 odd miles would not be wise.
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