Yes it’s very serious. My parents were called to the hospital numerous times to bid me farewell but being stubborn as I am I lived. I have been in induced comas for probably 3 years (cumulatively.) The longer seizures go on without stopping the less likely they will stop on there own which is why they put you in a coma, to stop the seizures. Besides Convulsive Status which people with Tonic Clonic seizures have there is Non Convulsive Status Epilepticus that sometimes happen in those with Absence and Focal seizures and emergency treatment isn’t as urgent. An acquaintance of mine went into Status and died in less than an hour which is a very long time to seize. Seizures use immense amounts of energy.