remember, APAP overdose kills you via liver failure, which can take days.. During that time, medical science has developed such that most hospitals will know how to save your life during that time.
You will start to experience symptoms of liver failure after 24 hours; by 48 hours you will be violently ill and your body will be completely compromised; by 72 hours you'll be comatose/dying..

Liver failure is an extremely painful way to go.. if you're going to kill yourself via overdose, please be a lot fucking smarter than to swallow a few bottles of tylenol.