6 days for 75km? I suppose this guy must've really been enjoying himself along the way. Don't think you need to precook stuff like quinoa. Can just cook it on an ethanol hobo oven pretty quick.
i know plenty of people who go on 20-25km day-hikes as a casual outing that requires no planning or forethought beyond waking up in the morning and deciding to go for a hike, and they'd all say 6 days for the west coast trail is a reasonable pace.
To be honest, the most enduro sport for me that I can do right now is kayaking, and I can do ~10 miles or so on flat water with my sorta tubby 10 footer in about 4 hours or so (with breaks)...and that's it, with a week's recovery afterwards.
Crazy distance for them, I'm impressed and a little jealous to be honest. Maybe I'll be there someday. :)))) <3