The Great Western Loop is a 6,900 mile route that combines large portions of the Pacific Crest Trail, Pacific Northwest Trail, Continental Divide Trail, Grand Enchantment Trail, Arizona Trail, and a 700 mile cross country section across the Mojave and Sonoran Deserts to connect the Grand Canyon to the PCT. It is a loop trail, and thus can be done in either direction and started and finished at any spot on the loop. Both people who have completed the loop have done it clockwise.
First completed by Andrew Skurka in April - November 2007: https://andrewskurka.com/adventures/great-western-loop/
"I don't think this one will be among your more competitive! And probably nor should it be -- just finishing the damn thing in a season is a remarkable feat. First photo of the trip was taken at the South Rim on Monday, April 9, 2007 at 5:22:06 AM (uncertain what time zone, sun was up already so I'm guessing maybe Mountain or Eastern and just hadn't updated it). I finished on November 6, 2007 at 9:36:00 AM according to a photo by James Q Martin. Hugging mom was the first thing I did. That'd put me at 213 full days and some change." -- Andrew Skurka (June 2020)