How Difficult Is Rim To Rim Hike?

How Difficult Is Rim To Rim Hike? Distance: 23.5 miles. Difficulty: Extremely strenuous. Elevation Change: 5761 feet elevation loss (North Kaibab trailhead to Bright Angel Campground) and 4380 feet elevation gain (Bright Angel Campground to the South Rim on the Bright Angel Trail). How long does it take to hike Rim to Rim? Many will