How Long Until My Time Runs Out?

Two weeks ago, my family and I went hiking and camping. When the storm hit and the mudslide erupted, my adopted sister shoved me into a ravine. My parents and fiance only cared about my sister. They remained completely unaware of my predicament. A week later, when the rescue team finally finds me, my parents accuse me of being selfish and malicious.—— "You clearly know that your sister is suffering from a terminal illness and is about to die, yet you still try to murder her!" they yell. "The bride for next week's wedding will be your sister. She has end-stage kidney cancer, and her dying wish is to marry your fiancé.Ethan. You have to agree to this!" "I agreed to their wedding, and for atonement. I am willing to donate my kidney to my sister, and I will also give her all the academic papers I own and the oil paintings I have collected." Seeing how sensible I was, my parents and my fiance all smiled with relief. They said, "I've grown up and become sensible. I'm no longer that willful elder sister who didn't know how to care for my younger sister." In my final three days, I will give them everything they want and leave behind a perfect image. And when I die, I hope they won't cry, mourn my death；