I bought three or four pair of Darn Tough seven or eight years ago, and have picked up an average of another pair about every year since.
I've yet to discard any of them, though one of the pairs from that first year is juuuuust about shot and probably needs to go.
My only other socks are a pack of cheap white athletic socks (only worn for... doing athletic things, not counting stuff like hiking) and a pair or two of very thin non-wool black dress socks that I almost never wear.
A warning: I'd avoid buying them on Amazon, I got one pair on there that I'm pretty sure were counterfeit (felt much cheaper, developed holes after just a couple wears, fit was way different from all my others) so I only buy straight from DT now.
