How long can it take for lung cancer to kill you without chemo?

Depends: It depends on the stage of the disease the survival for stage 4 limited.

Depends: Cancer can kill by direct extension into a vital structure, or by metastasizing to different organs. The time it would take would depend on the type of lung cancer, location, size, and whether it had spread to the blood or lymphatics. With or without chemotherapy, there are too many variables to give a standard answer.