Over the music, you may hear some whistling. We did this so that anything that may be hiding in one of the cracks or crevices would know we were coming. We were pretty close to Bright Angel Campground, so we were pretty sure that there wouldn't be any cougars near. We still felt it was worth a few whistles, and the next morning I ran into a family of deer, so there was food up there other than us.
Over all, the climb to the flats took us about an hour and a half almost straight up the canyon wall. At any point in these films, the person that's in the lead is always above the trailing person's head. Epic.