Most seizures last between a few seconds and a few minutes, depending on the type. The critical threshold to know: if a seizure lasts longer than 5 minutes, it’s a medical emergency requiring a 911 call. Understanding what’s normal for different seizure types helps you respond calmly and know when something has gone wrong.
Duration by Seizure Type
Not all seizures look the same, and they vary widely in length. The type most people picture, a tonic-clonic (or “grand mal”) seizure with muscle stiffness and rhythmic jerking, typically lasts a few minutes. It often feels much longer to someone watching, which is why timing matters.
Absence seizures are on the opposite end of the spectrum. These cause a brief blank stare and generally last just a few seconds, with most ending in under 15 seconds. They’re so short that bystanders sometimes don’t realize a seizure happened at all.
Focal seizures, which start in one area of the brain, can last up to several minutes. Those originating in the frontal lobe tend to be shorter than those starting in the temporal lobe. During a focal seizure with impaired awareness (previously called a complex partial seizure), a person may stare, make repetitive movements, or seem confused but won’t fully lose consciousness the way they would in a tonic-clonic seizure.
Some seizure types are extremely brief. Atonic seizures, sometimes called “drop attacks” because they cause a sudden loss of muscle tone, typically last less than 15 seconds. Myoclonic seizures, which produce quick muscle jerks, are even shorter and can be over in a fraction of a second.
Febrile Seizures in Children
Febrile seizures, triggered by fever in young children, are classified as simple or complex based largely on duration. A simple febrile seizure lasts fewer than 15 minutes, causes loss of consciousness and uncontrollable movements, and happens only once within a 24-hour period. These are the most common type and, while frightening to witness, are generally not harmful.
A complex febrile seizure lasts longer than 15 minutes, may involve pauses between convulsions, and can occur more than once within 24 hours. Symptoms sometimes affect only one side of the body. Complex febrile seizures warrant closer medical evaluation to rule out underlying causes.
The 5-Minute Rule
Five minutes is the number to keep in mind. The CDC recommends calling 911 if any seizure lasts longer than 5 minutes. A seizure that doesn’t stop on its own within this window is at risk of becoming status epilepticus, a prolonged seizure state that can cause brain injury and requires emergency treatment.
If you witness a seizure, start timing it as soon as it begins. Your instinct will tell you it’s been much longer than it actually has. Using a clock or phone timer gives you an objective measure and provides crucial information for paramedics or doctors. You should also call 911 if the person doesn’t regain consciousness after the seizure stops, if they have a second seizure shortly after the first, or if it’s their first seizure ever.
Recovery Takes Longer Than the Seizure
The seizure itself is only part of the experience. After it ends, most people enter a recovery phase called the postictal state. This can involve confusion, fatigue, headache, difficulty speaking, or emotional changes. On average, the postictal state lasts between 5 and 30 minutes, but it can stretch from a few minutes to several days depending on the seizure’s severity and the individual.
Tonic-clonic seizures tend to produce the most intense recovery periods. A person may feel exhausted, disoriented, or have no memory of what happened. Shorter seizures like absence or myoclonic episodes usually have minimal or no postictal symptoms.
Seizure Clusters
Sometimes seizures don’t occur in isolation. A seizure cluster is a pattern of multiple seizures happening over hours or days. The person typically recovers between individual seizures, and the cluster eventually ends on its own. Clusters are distinct from status epilepticus because each seizure stops before the next one begins. If you or someone you know experiences clusters, a neurologist can prescribe a rescue medication designed to be given at home to help break the cycle.
Tracking Seizure Duration
If you or a family member has epilepsy, keeping a seizure diary gives your doctor the information they need to adjust treatment. The key details to record are when the seizure started, how long it lasted, what it looked like, and what happened during recovery. Paper calendars work well for tracking frequency and identifying patterns related to triggers like sleep, stress, or menstrual cycles. Digital tools like Seizure Tracker allow you to log events electronically and even attach video, which can be especially valuable when a doctor needs to identify the seizure type. If multiple caregivers are observing seizures, a shared paper event diary helps ensure consistent, detailed records.