slide 2 of 12. Skin The skin is the largest organ in the human body. Its main job is to maintain the body's temperature, which means that sweat is created to cool the body, and goosebumps or raised hair occur to trap heat in the body. Along with sweat glands, the skin contains oil glands.
...However, if I am wrong about that, the answer is that acetaminophen (and its metabolites) are identifiable for up to 48 hours after you took the pill. Less if you took tiny doses, but up to standard clinical doses (<8g), it's 48ish hours.
Acetaminophen is tylenol and the body can take no more than two.... Acetaminophen is Tylenol and the body can take no more than two at one time every 4 hours assuming you don`t have a 12 hour time release pill. In that case, just take one every 12 hours. Any more at one time and you will damage your organs.