Fiancee has stage fourcirrosis liver cancer before he can get put on the trnsplnt list needshis hepc under contrl, how much time does he have really?

Child-Pugh score. You can look up the way to calculate this here: http://www.Mdcalc.Com/child-pugh-score-for-cirrhosis-mortality/ this will add up the numbers for you and give you a life expectancy. Some of those things can be improved through nutrition and strict compliance with medicines and doctor's advice, so help him do it!
Liver cancer. Nobody knows exactly how much time a person has to live under these circumstances. His doctors are the best judge of the approximate time.