With the salt of my type, a couple of minutes, or rather breaths, will be enough. Since, in fact, the question has already been answered, one can carry unintelligible nonsense that is not interesting to anyone, which I, as a decent person, am not going to do.
If a person is placed in a bath with saline - that is, with 0.9% NaCl, then he will be quite comfortable, because the osmotic pressure will be balanced. If the salt concentration is higher, then the osmotic forces will draw out water, and after a while a person will probably want to drink. If he drinks fresh water, and compensates for its loss, then probably this way you can lie down for a long time.