there is a book by dr. alpert rupert better known as baba ram das called 'be here now'. there is a section in the book, that is titled "learning to die". basically what it talks about is to medidate to reach a point when you are just as dead as real. however while doing so, you are only dead in mind but not body. but how can the body stay alive without the mind. well, that is exactly the point of that meditation. i still practice that but haven't achieved the point where i am actually dead. i know i will one day. may be the moment i actually die, i would experience death. or i might just experience before that. going back to your question. if i knew that i was goign to die in 24 hours, i would just continue to do what i would normally do. it's not gonna be special because you can only do so much in 24 hours. if i was do something, either i would have already done it, or it will probably never gonna get done. because once you are dead, it is the end of the world. there is nothing after that. at least that's what i want to believe.