Rodion, if you are asking about how long butane stays good the answer is practically forever. So long as the refill can or the lighter are not leaking they can sit on the shelf for the rest of your life, and then be used to light the memorial candles on your grave.
heh heh I'll second that - had a refill cannister from the 70's that I found recently. I used it in my Blazer and the butane is working fine!
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