In ancient times, people's ability to deal with coma was limited due to the lack of modern medical technology and equipment. Generally speaking, if a person is in a coma for a long time and can't get proper treatment and care, then he probably won't survive. For example, if a person is in a coma due to a head injury or other serious diseases, they may need nasal feeding to maintain their life, which was not easy to achieve in ancient times.
However, if the cause of coma is short and mild, or if the patient gets proper care and treatment, it may be possible to get through this difficult period and recover. For example, if a person loses consciousness because of hunger, fatigue or temporary illness, they may regain consciousness after getting proper food and rest.
Generally speaking, the coma of ancient people for many days does not necessarily mean death, but due to the limitations of ancient medical conditions, the chances of survival are relatively small.