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20 to 40 years, depending on the exact design. Most were never kept in stockpile that long. However as we can't test new designs several stockpile weapons are now beyond their design lifetime.
The early ones had some components with a shelf life under 6 months, but frequent replacement of those components could keep them usable for many years.
What else can I help you with?
Which nation tested a nuclear weapon after the US?
USSR
Who gave nuclear weapon to US?
Nobody, the US was the first country to work out how to actually make nuclear weapons.
Who started nuclear testing?
The US performed the first nuclear weapon test on July 16, 1945.
What were the results of the US using Nuclear weapon on Japan?
End of WW2.
Can nuclear plant explosions be avoided?
The US has 104 operating reactors and none of them have exploded. It's a matter of good design and operating methods. Nuclear explosions though are not possible in a commercial nuclear reactor, because the nuclear fuel is not sufficiently enriched to make a weapon, whatever happens in the reactor.
When did the soviet want to invade the us with nuclear bombs?
never, most of their nuclear weapon activity was for propaganda purposes.
Which country make use of the nuclear weapon in World War 2?
US
How did the US feel about the soviet union developing a nuclear weapon?
They were pretty nervous...................
What was the name given to the US effort to develop the first nuclear weapon?
Manhattan project
Does the us have the right to say who does and does not get to have nuclear weapons?
no one can have a nucular weapon except the government and such
What was the name of the project that led to the US developing the first nuclear weapon?
The Manhattan Project.
Does us have missile defense system set up to combat any nuclear weapon?
no
