For patients with brainstem hemorrhage, how many days it takes to regain consciousness depends on the location of the bleeding and the amount of bleeding. If the amount of bleeding is small, the patient's consciousness often gradually awakens within 24 to 48 hours. There may be short-term language impairments, manifesting as unclear speech, difficulty speaking, articulation disorders, and accompanied by significant swallowing difficulties, indicated by choking on water, but this will gradually improve over time. If the bleeding is substantial, it often leads to the patient being in a coma for a long time, and may even enter a vegetative state for an extended period, unable to regain autonomous consciousness.