My family is a bit of a Chaco cult. We've climbed 14'ers in Colorado in them, my sister wore Chacos under her wedding dress, and I unintentionally ended up living and working close to the HQ.

I personally have walked 10 miles in a pair, but it was pretty casual walking.

Get them on sale, and send them in to get refurbished from time-to-time. They are fantastic.