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Actually not long, but it depends on the level and type of contamination.

Most urban areas can be reoccupied in a few days to at most about 4 months. The radioactivity will have to be periodically measured with ionization type radiation survey meters (geiger counters can't be used for this) to determine when it become low enough to be safe.

Areas that were hit with surface or subsurface bursts (e.g. missile silos, airfields) may be so heavily contaminated that they cannot be reoccupied for years to centuries.

These periods of time can be shortened by various decontamination techniques, but this can get very expensive compared to just waiting for the various radioisotopes to decay.

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