Generalized tonic-clonic seizure that either lasts >5 minutes or occurs multiple times without regaining normal mental status in between.
Generalized tonic-clonic seizures should cause diffuse motor activity and loss of consciousness.
Self-terminating seizures will generally stop within <5 minutes (so persistence beyond 5 minutes implies that active medical therapy is required to stop the seizure).
Focal Seizure with impaired awareness that lasts >10 minutes. This must be differentiated from a simple aware seizure (e.g., movement of one extremity with retention of consciousness). A prolonged simple aware seizure is classified as epilepsia partialis continua