There is no rule or law for the time limit in which an autopsy may be performed. In fact, some autopsies are performed on bodies that are disinterred from the grave months or years later. Ideally, the autopsy should be performed as soon as possible the day of death or early the following day. In some cases that is not possible so the body must be placed in refrigeration so that autolysis interferes minimally with the results. Autopsies can also be performed after embalming has taken place but ideally it would be better if the body was not embalmed thus not hampering any toxicology that may need to be obtained.