The electromagnetic (EM) spectrum is the range of all types of EM radiation. Radiation is energy that travels and spreads out as it goes  the visible light that comes from a lamp in your house and the radio waves that come from a radio station are two types of electromagnetic radiation.
According to my doctor, 4 hours. You can switch them up. Take acetaminophen, (Tylenol), then wait 4 hours and take Ibuprofen, wait another 4 hours and take acetaminophen and sâ¦o on.
I takes approximately 4 hours for tylenol to leave your body.... 0. 0. I takes approximately 4 hours for Tylenol to leave your body. However, if you have the time release 12 hour medication, it won`t leave your body for 12 hours. This type of pill you only take 1 every 12 hours.. It takes acetaminophen which is Tylenol, 4 hours to leave your body so long as it is not a 12 hour time release pill. In that case, it would take 12 hours.