My uncle was told his lungs are collapsing and there is nothing doctor can do anymore and the oxygen is no longer working. how long before he dies?

See lung specialist: Lungs collapsing may mean that he is having mucous plugging and lungs are atelectetic. His mortality depends on the exact diagnosis and severity of his condition.He may have end stage lung disease with severe emphysema and respiratory failure, it also depends on his age and his overall medical conditions as far as the mortality is concerned. Hospice care may be necessary.