Oh dear God! Wow, it depends on the individual's overall health, will to live and stage of the terminal cancer. I pray for strength for whomever the person is.
How Long Can You Live With Terminal Lung Cancer?
Terminal lung cancer must mean they are in stage 4 is that right. I am so sorry to say life will be shortened very quickly. You can't give an exact time because only god knows that, so enjoy what time is left and be with your loved ones.