The length of a coma varies greatly from person to person and depends upon the severity of the injury causing the coma, the patient’s overall health, and other factors. Some comas last only a few hours or days, while others can last weeks, months, or even years.
For those who remain in a coma or vegetative state for a very long time, the chances of recovery decrease. However, there are notable exceptions, and some people have emerged from a coma after many years, although they often face significant physical and cognitive challenges.