The denaturant makes the alcohol taste bad. When a denaturant is added to alcohol it is called denatured alcohol or Alcohol Denat. Denatonium Benzoate is a common denaturant. It a quaternary ammonium compound that is considered the bitterest compound known. Quassin, Brucine and Brucine Sulfate are bitter alkaloid compounds obtained from plants.
Well, there can be some irregular pacing, breathing before the seizure. That can last from a few minutes to 30 minutes or more. The seizure itself should not be longer than a few minutes. Anything over 4-5 minutes is a huge risk for brain and body injury. After the actual seizure, a pet can remain disoriented, but they are at least responsive, for another few minutes to hours.
Although seizures seem to last a long time, they usually do not last more than 60 to 90 seconds. Time the seizure, if you can. If the seizure lasts longer than 3 minutes or the person seizing is pregnant (no matter how long the seizure lasts), call 911 or other emergency services immediately. A seizure can be terrifying to watch, especially if you've never seen one before.