Most seizures last between a few seconds and three minutes, depending on the type. A seizure that continues beyond five minutes is a medical emergency requiring a 911 call. The exact duration varies widely by seizure type, so understanding what’s typical for each kind helps you recognize when something has gone on too long.
Duration by Seizure Type
The type of seizure determines how long it typically lasts. Here’s what to expect for the most common types:
- Absence seizures: These brief staring spells last about 10 seconds, though they can stretch to 30 seconds. They’re easy to miss entirely. Some people experience many episodes in a single day.
- Focal aware seizures: Previously called simple partial seizures, these average around 28 seconds of visible symptoms. You stay conscious throughout but may experience unusual sensations, twitching, or a strange taste or smell.
- Focal impaired awareness seizures: These last roughly a minute on average and involve confusion or altered consciousness. You might stare blankly, make repetitive movements like lip-smacking or hand-rubbing, and have no memory of the episode afterward.
- Tonic-clonic seizures: The type most people picture when they think of a seizure. The body stiffens, then jerks rhythmically. These resolve on their own after one to three minutes in most cases.
The Five-Minute Rule
Five minutes is the critical threshold. A seizure lasting longer than five minutes, or multiple seizures without the person regaining normal consciousness between them, qualifies as status epilepticus. This is a life-threatening condition that can cause brain damage if not treated quickly.
The CDC recommends timing any seizure from the moment it starts. If it passes the five-minute mark, call 911 immediately. This applies regardless of seizure type. Even if someone has a known seizure disorder, a seizure that won’t stop on its own needs emergency intervention.
What Counts as “Too Long” for Each Type
While five minutes is the widely used emergency threshold, research suggests the ceiling for “normal” duration actually differs by seizure type. A video-EEG study found that 99% of focal impaired awareness seizures ended within 7 minutes, while focal aware seizures could run as long as 11 minutes before being considered prolonged. For tonic-clonic seizures, anything beyond 5 minutes is abnormal.
In practical terms, this means a focal seizure lasting 4 minutes, while longer than average, isn’t necessarily cause for alarm. But a tonic-clonic seizure at the same duration is approaching the danger zone. If you’re caring for someone with epilepsy, their neurologist can help define what “too long” looks like for their specific seizure pattern.
Recovery Takes Longer Than the Seizure
The seizure itself is only part of the picture. Afterward comes the postictal state, a recovery period that typically lasts 5 to 30 minutes but can stretch to several days in some cases. During this time, a person may feel confused, exhausted, or disoriented. Headaches, muscle soreness, and difficulty speaking are common. Some people fall into a deep sleep.
How long recovery takes depends on the person and the intensity of the seizure. Absence seizures often have no noticeable recovery period at all. Tonic-clonic seizures tend to produce the most significant postictal symptoms. If recovery symptoms persist beyond 24 hours, that warrants a call to a healthcare provider.
Febrile Seizures in Children
Febrile seizures, triggered by fever in young children, follow their own timeline. A simple febrile seizure is generalized (affects the whole body), lasts less than 15 minutes, doesn’t recur within 24 hours, and is followed by full recovery within one hour. Most are much shorter than that ceiling, often ending in under 5 minutes.
A febrile seizure is classified as complex if it lasts longer than 15 minutes, involves only one side of the body, or happens more than once in a day. Complex febrile seizures need prompt medical evaluation. Simple febrile seizures, while terrifying to witness, are generally not harmful and don’t indicate epilepsy.
How to Time a Seizure
When you witness a seizure, your sense of time distorts. Thirty seconds can feel like five minutes. That’s why health organizations specifically recommend looking at a clock or starting a timer on your phone the moment a seizure begins. An accurate time count is the single most useful piece of information you can give paramedics or a doctor afterward.
While timing, keep the person safe by clearing hard objects away from them and turning them gently onto their side if possible. Don’t put anything in their mouth or try to hold them down. Most seizures will end on their own. Your job is to track the clock, stay calm, and call for help if it crosses five minutes.