There is no fixed period of time for how many days a person resuscitated by CPR will be unconscious, depending on the cause of the disease and the subsequent course of treatment. CPR is a rescue measure that alternates between artificial respiration and chest compressions, but it is not a therapeutic measure for treating illnesses. Therefore, if a person is unconscious, loses spontaneous breathing, or has a suspended heartbeat for a variety of reasons, CPR can be used to resuscitate him or her, but the exact length of time that he or she will be in a coma is dependent on the cause of the illness and the subsequent treatment process. If CPR is needed for reasons such as drowning, or the treatment after CPR has achieved better results, then the coma time is generally not too long, and may even wake up on the same day. If it is a more serious situation such as car accident, cerebral infarction, etc., or the follow-up has not been effectively treated, CPR resuscitation may be comatose for a longer period of time, or even unable to wake up until death. Specific cases should be analyzed, and should be treated in a timely manner and in accordance with medical advice.