A subarachnoid hemorrhage coma can take hours to awaken, but it can also take weeks to awaken. Trauma-induced subarachnoid hemorrhage often awakens within a few hours to a week after symptomatic treatment if the craniocerebral injury is not severe, but may take longer to awaken or may not awaken if accompanied by severe craniocerebral injury. Coma caused by intracranial aneurysm with subarachnoid hemorrhage, if there is no pupil dilatation and no brain hernia, surgery or endovascular intervention is feasible, if the operation goes well and the postoperative treatment is appropriate, the patient may wake up within 2 weeks. If the patient’s condition is critical, brain hernia or severe cerebral vasospasm has occurred, a few patients may be awakened in about 3 weeks after surgery or endovascular intervention, but most of the patients can not be awakened or even life-threatening. No matter what the cause of subarachnoid hemorrhage coma is, it is necessary to go to the hospital immediately for diagnosis, and then the neurologist will provide appropriate treatment according to the patient’s condition.