Each organ has a specific timeframe in which it must be transplanted after it has been recovered: Heart: 4 – 6 hours. Lungs: 4 – 8 hours. Liver: 8 – 12 hours. Pancreas: 12 – 18 hours. Intestines: 8 – 16 hours. Kidneys: 24 – 36 hours. Apr 7, 2022