On September 8th, I reached the northern terminus of the Great Divide Trail at Kakwa Lake and finished hiking the AZT to GDT Route. There's more info on the route itself at http://benmayberry.net/azt-to-gdt and more info on my trip at http://benmayberry.net.
I haven't calculated the total mileage yet but I think it will be less than the 4,300 miles that I estimated before I started. The route may be a bit longer than some hikers will want to travel in one season but it's an incredible route (passes through 14 national parks, nearly a thousand miles of the Colorado Plateau AND the entire length of the southern Canadian Rockies) that deserves to be repeated and is more approachable than it might appear.
For anyone interested in a shorter version, my first recommendation would be hiking an Arizona Trail-Hayduke Trail-Continental Divide Trail combo. My second recommendation would be hiking the CDT followed by the Great Divide Trail.