In 1884, four sailors were left adrift after their ship sank. They had two tins of turnips and managed to catch the (very) occasional fish. So, after 20 days adrift, they slit the throat of the cabin boy and ate him, before being rescued a few days later. As I write this, it's is past my usual lunchtime and I'm quite hungry. So my immediate response is "20 days?! They waited 20 days before getting dinner ready? Such self-control is admirable."
Don Lerman once ate 800 grams of butter in 5 minutes. How long would a cabin boy of lasted him?