I have two tanks with two socks on each. They get changed out every week, so 4 get put into a salt bucket inside out with bleach and water until covered. The next week another four go in on top and more bleach/water added. I do two buckets like this. Once the the second bucket is half full, I throw the first bucket in the washer, still inside out and run it once with nothing. I then turn them the right way out and run them again. They go into a big 40 gallon brute can with about 20 others to dry out for at least a week.
Oh yea, I do dump the bleach water muck down the outside utility sink and rinse the bucket/socks out a couple times outside so that the bleach smell is not so overpowering inside.
So, I am soaking at least a week, sometimes three, but there is no set time for me.