If the essence of life is the arrangement and combination of matter, how long will it take for people to complete the arrangement and combination again after death and realize the so-called "rebirth"?

Looking at the world objectively, the essence of life is indeed the arrangement and combination of matter. After death, the arrangement and combination of substances have undergone irreversible changes. Through physical and chemical changes, matter is not the original matter, the structure is falling apart, and it is no longer the original combination, so it cannot be reborn. That's not what Buddhism and Taoism say. Escape from life and death. Entering nirvana, neither being born nor dying, does not represent the general life form. Buddhism is too difficult for me to understand.