For three-season hikes, I usually just wear my one pair of hiking socks, and carry a very lightweight pair of liner socks for sleep wear (to help keep my bag cleaner). One pair for hiking is sufficient for me because I don't get blisters from hiking in wet socks/shoes (YMMV). Also, no matter how soiled, it's fairly easy to wash a pair of socks and have them dry overnight. Again, for me, even if the socks should remain damp the next day, that doesn't bother my feet. At the end of the hike, when riding back home with others, I may change into my sleeping socks to avoid stinking up the entire car. :)
For winter hikes where keeping dry is critical, I will carry extra pair(s) of hiking socks.