Weapons grade plutonium has a half life of 24,110 years

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Weapons-grade plutonium is defined as containing no more than 7% ²⁴⁰Pu; this is achieved by only exposing ²³⁸U to neutron sources for short periods of time to minimize the ²⁴⁰Pu produced. Plutonium is classified according to the percentage of the contaminant plutonium-240 that it contains: Supergrade 2–3%

Plutonium-239 - Wikipedia

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How long does weapons-grade plutonium last?

The most stable isotopes are plutonium-244, with a half-life of 80.8 million years; plutonium-242, with a half-life of 373,300 years; and plutonium-239—the isotope of greatest interest—with a half-life of 24,110 years.