To be clear, I do not know if this is the actual "double" route but I did the standard 5 Peak route out and then reversed back the exact route. Maybe an "Out and Back" route can be added?
Great day to attempt this. Overcast sky and some rain with about 55 degree temps. Felt really good the whole time going out and finished the standard 5 Peak route in 2:58. I got bit by a dog but it was a good adrenaline boost I guess. I took about a 10 minute break at the bottom of Cowles to eat some snacks and refuel then headed back out on the reverse route. Rain started to pick up a little and I knew I was moving slower but kept pushing along. Total time was 7:28:24. Total mileage 32.73 miles. I am certain at least an hour can be knocked off this time.