No simple answer, all depends on the type of explosive. Some have varying life before they are sent back, they may be partial refurbed, fully or just disposed of. Depends on how they've been stored or used ie have they been out of the 'packet' they may not have been fired but it may start the clock ticking down for refurb if they have.
Some may last for years in their proper containers if stored correctly.
Some may be consistently supplied as they have short shelf lives and there's no simple refurb process. Some are purchased in batches.
Can vary if you have air launched missiles vs sea launched ones even if they are similar (i know we haven't sent anything like that it's just an example) due to their differing environments, humidity, temperature, vibration etc that they are carried/operate in.
As to what's in life and ready to go, for obvious reasons it's not made public. You can find out how many of been purchased over the years that normally is made public.
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