Hope it's not too late to reply to this post-- I see it's been up for a while. Definitely break the trip into 2 days, at least. Some of the trail sections are pretty rugged/rocky and steep in BB. And it's also so beautiful you'll want to spend the time. Also bring layers, b/c it gets pretty hot during the day, but can be very cold and windy on the Rim at night. Sunscreen also a necessity. I've never been in the fall, but have been twice in January, and even then the sun can do a number on you. It's a beautiful, magical place. Have fun.
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