Concussions generally require about one to two weeks of rest, depending mainly on the specific symptoms of the patient. If the symptoms are relatively mild and the injury was not particularly severe, then about a week of rest is usually sufficient for returning to normal work and study. In some cases, if the concussion was relatively severe at the time of injury and subsequent complications or sequelae occur, then the rest period may need to be appropriately extended, possibly to about a month, depending on the patient's specific symptoms. In the vast majority of cases, resting for two weeks is generally sufficient for returning to normal work and study without involving any special issues. As long as medical advice is followed and treatment is correctly administered, many concussions can heal completely.