alt Hacker NewsThis can easily happen over the course of 24 hours if you're in "fuck me I'll do anything to make it stop" levels of pain. I've taken more than 20 ibuprofens in a day a few times in my life, which, while not medically advised, did not kill me. I actually had no idea acetaminophen was so dangerous.
Just in case, ibuprophen does not work well for pain relief [at lest for some kind of pain]. Paracetamol [acetaminophen] usually is much better against pain. And paracetamol + ibuprophen can help with strong pain for which neither paracetamol or ibuprophen work at normal doses.