How long it takes a patient with diffuse axonal injury to recover is related to the severity of the patient’s injury. Patients with milder conditions usually take up to 3 months, while those with more severe conditions take longer and may even be in a coma for a prolonged period of time. Diffuse axonal injury is a very serious closed craniocerebral injury, which can cause extensive intracranial neural axonal rupture, leading to nerve conduction pathway obstruction, triggering severe consciousness disorder and coma, and the recovery time is very slow. Patients with relatively mild disease usually need 3 months to recover. If the condition of diffuse axonal injury is more serious or combined with primary brainstem injury, the patient’s coma lasts for a very long time, half a year or even long-term coma or in a vegetative state of survival. When diffuse axonal injury occurs, it is recommended to go to the hospital in time and follow the doctor’s instructions for treatment.