18s isn’t even the maximum. If you are stabbed by another commoner, they have only a chance of 65% to hit your ac, so the average damage per turn is 2.5*0.65=1.625
On average, you would survive 12s and become unconscious after 18s, dying after 24s from two more direct attacks
But as a commoner you only have 4hp
So you can survive up to three stabs, but not four.
Or more hilariously, 18 full seconds of being attacked.
18s isn’t even the maximum. If you are stabbed by another commoner, they have only a chance of 65% to hit your ac, so the average damage per turn is 2.5*0.65=1.625
On average, you would survive 12s and become unconscious after 18s, dying after 24s from two more direct attacks
dnd was realistic all this time?