Most seizures last between a few seconds and three minutes, depending on the type. A tonic-clonic seizure, the kind most people picture when they think of a seizure, typically resolves on its own within one to three minutes. Shorter seizure types can be over in under 15 seconds. Any seizure lasting longer than five minutes is a medical emergency.
Duration by Seizure Type
Not all seizures look the same, and they vary widely in how long they last. Here’s what to expect from the most common types:
- Tonic-clonic (grand mal) seizures: One to three minutes. These involve stiffening of the body followed by rhythmic jerking and are the most recognizable type.
- Absence seizures: Less than 15 seconds. These cause brief staring spells and are most common in children. A child may have 10, 50, or even 100 of them in a single day, often without anyone noticing.
- Focal aware seizures: Less than two minutes. The person stays conscious but may experience unusual sensations, twitching, or changes in how things look, smell, or taste.
- Atonic seizures: Less than 15 seconds. These cause a sudden loss of muscle tone, which can lead to falls or head drops.
- Myoclonic seizures: A fraction of a second to a few seconds. These are quick, shock-like jerks of a muscle or group of muscles.
Focal seizures that impair awareness (sometimes called complex partial seizures) tend to last longer than focal aware seizures, often one to two minutes, though they can stretch beyond that. During these, a person may appear confused, make repetitive movements like lip-smacking or hand rubbing, and not respond normally to their surroundings.
The Five-Minute Rule
Five minutes is the critical threshold. A seizure lasting longer than five minutes, or multiple seizures occurring back-to-back without the person regaining full consciousness in between, is classified as status epilepticus. This is a neurological emergency that can cause permanent brain damage or death if not treated promptly. The CDC recommends timing any seizure you witness and calling 911 if it passes the five-minute mark.
Most tonic-clonic seizures stop well before this point. But because it’s impossible to predict whether a given seizure will end on its own, timing it from the start gives you the information you need to act quickly if it doesn’t.
Febrile Seizures in Children
Febrile seizures are triggered by fever, usually in children between six months and five years old. Simple febrile seizures, the most common type, last a few seconds up to 15 minutes and occur only once within a 24-hour period. They affect the whole body and, while frightening to watch, are generally not harmful.
Complex febrile seizures are defined by lasting longer than 15 minutes, occurring more than once in 24 hours, or affecting only one side of the body. These warrant closer medical evaluation, though most children who experience febrile seizures of either type do not go on to develop epilepsy.
What Happens After a Seizure
The seizure itself is only part of the experience. After certain seizure types, particularly tonic-clonic and focal impaired awareness seizures, the brain enters a recovery phase called the postictal state. During this period, a person may feel confused, exhausted, disoriented, or emotionally upset. Headaches, muscle soreness, and difficulty speaking are also common.
This recovery phase averages five to 30 minutes but can last significantly longer. Some people feel back to normal within minutes, while others need a full day. If postictal symptoms persist beyond 24 hours, that’s worth a call to a healthcare provider. Not all seizure types trigger a noticeable postictal period. Absence seizures, for instance, typically end abruptly, and the person returns to whatever they were doing with no recovery time needed.
Seizure Clusters
Sometimes seizures don’t come one at a time. A seizure cluster is a pattern of multiple seizures grouped closely together, with relatively short gaps of normal function in between. Definitions vary, but a commonly used clinical threshold is three or more seizures within 24 hours. Some definitions use two or more seizures within six hours.
Clusters represent a distinct worsening of seizure control and are treated differently from isolated events. People with epilepsy who have a history of clusters often carry a prescribed rescue medication to use at home, which can help stop the pattern before it escalates to status epilepticus.