Mbd, welcome. This is a question that is asked repeatedly, but to which we have no answer. Every liver patient is different. Some last a long time, even drinking. Others go downhill overnight. One thing is certain: Drinking is the worst thing that a liver patient can do. It will definitely hasten is demise.
You say you're not sure if he is drinking again, but then you say he has not lied about it. So is he drinking or not? If not, he might be eligible for a liver transplant. If he is, then he wouldn't be eligible until he has 6 mos. of documented sobriety.
For more information, read some of the older posts, as Allie suggested, and also read the information in the Hepatitis Resources folder at the top of the forum.
Forum moderator - Hepatitis
"But that was yesterday, and I was a different person then."
Lewis Carroll, Alice in Wonderland