Yeah they said only pickles, and even with the liquid in the pickles it’s so briny that unless they are also drinking additional water their kidneys would keep using more water the same way drinking salt water would cause. I took the question as only pickles and that, as you said, would only last until dehydration sets in. Now if they have unlimited fresh water I’d say until malnutrition so maybe a few weeks, a few horrible weeks. Just playing along and speculating, I am not a MD.