One litre. There was a story about a nineteen-year-old American student who drank a liter of soy sauce on a bet. After a couple of hours, the guy died, and he was quickly brought to the ambulance.
The potentially lethal dose of salt ranges anywhere from 0.75 to 3 grams per kilogram of body weight. The student drank about 160 - 170 grams of salt. Usually, after such poisoning, it is impossible to save, so the ambulance doctors took a risk and aggressively corrected what they found on the guy. They are all lucky.
The student was young and strong. The quick recovery trick worked, and the guy returned home 4 days later. During this time, he managed to fight with convulsions, lay under anesthesia on artificial ventilation, tore out the endotracheal tube from his throat himself and did not damage himself anything serious.
His brains remained unharmed, and the student then successfully passed the exams. A unique case. Since the doctors did not hope to save this eccentric, they took an aggressive approach. A miracle happened. The approach worked, and the guy survived.
They say that even in ancient China there was such a method of poisoning. Salt.
And even in the sixties or seventies of the last century, they tried to wash the stomach of poisoned people with a cool solution of salt. True, they quickly realized that sometimes they die from this even more often. In short, do not drink anything to argue.
It seems to me that, on average, a weak loose sauce is brought along with the rolls. Some decent brand in a nice bottle from the store tastes awfully salty. Didn't you notice?