At the start of Avengers: Endgame, Iron Man is at the brink of death and "thousands of light years from the nearest 7-11" when Captain Marvel shows up. It appears like Captain Marvel carries neither food nor oxygen, yet brings the spaceship to Earth before Iron Man dies.
Question: To rescue Iron Man (and Nebula), how long did it take Captain Marvel to travel to Earth?
Captain Marvel doesn't use the bifrost nor the space stone, she just carries the spaceship back to Earth. She would have to do this rather quickly to ensure Iron Man gets back in time to eat an "American cheeseburger".