Time Travel for All, Starting from Unlimited Copies

Five hundred years ago, the universal copy came. Everyone has only three days to live after activating the copy system at the age of eighteen. Zhang Xiaochuan obtained the SSS-level dungeon talent at the beginning—lucky! If you want to extend your life, you must travel between different dungeons, complete tasks and gain time rewards in order to survive. Money? Useless. Real estate? It makes no sense. In the face of the urgent need to survive, everything in the world is meaningless. Everything... Time to change...