It is possible if he can find a match, though there is some risk for the donor. I believe this was the procedure one of our members, 'orphanedhawk' had. You might try putting her name in the search box at the top of the page.
he is not at a transplant center and he wants to leave the hospital today. He's not even on a list yet. His family is getting together to see if they can be a living transplant, if they can donate a piece of their liver, is this possible?, since the liver rejuvenates itself?
"If my former hubby stays in hospital and gets treatment are his chances good?"
If he is being treated at a transplant center and he is "listed" for a transplant he has a great chance of surviving.
"How long does he have to get a transplant?"
Livers are given to the sickest patients first. This is measured by his MELD score.
If his MELD score is in the 30s (assuming type O blood) that usually indicates he will be able to get a transplant soon, depending on how many other people are waiting.
We need more details of his condition to fully assess.
Hectorsf