How long is it supposed to it take a person to die from lung cancer?

Variable. There are different cell types and growth rates( called doubling times)! the small cell, undifferentiated as an example is very fast and most folks die within a year(?Or 2). Some of the squamous cancers are slower and may be quite large and asymptomatic even when large. Very variable depending on type, size, location, stage and response to treatments.
Depends on stage. Stage 1a - maybe never (die of something else) stage 4 - several weeks to few months.

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