Re: symptoms when the body starts to shut down
It might depend on whether he's home or in the hospital with an IV hooked up. If he's home, it sounds like he might have a few days. If he's in the hospital with an IV, he likely could have a little longer.
In my opinion, the doctors should have given some timeframe. Some idea is better than no idea. Doctors, like the rest of us, are only human and some are good at this (emotional issue) and some are not. You might have better luck asking the nurse who's in charge of his care.