Rashi on Genesis 43:2/רש"י על בראשית מ״ג:ב׳

1כאשר כלו לאכל WHEN THEY HAD EATEN UP — Judah said to them: Leave the old man alone until the house will run short of bread (Midrash Tanchuma, Miketz 8).

2כאשר כלו WHEN THEY HAD FINISHED [EATING THE GRAIN] — The Targum renders it by כד שציאו which means “when they finished” in the sense of making an end of doing an action. He who has the reading in the Targum כד ספיקו “when they had enough” is in error. The words (24:22) כאשר כלו הגמלים לשתות “when the camels had finished drinking” are rightly rendered in the Targum כד ספיקו which means “when they had drunk sufficient for their needs”, for that was the end of their drinking. Here, however, this phrase “when they had finished eating” refers to the time when the food came to an end, and we should render it in the Targum by כד שציאו when they had finished (which means finishing in the sense of nothing being left over).