My 22 Year Son Was Involved In Car Accident. He

My 22 year son was involved in car accident. He had serious internal injuries. As a result of surgery he has a perforated small intestine. He currently has drains to collect bile and is being fd Intraveniously. How long will the intestine takctonheal or scar over. What length of time is given to see if it is heard before vowel surgery is considered?