Roughly, a 12 oz may last you half a case. 20 oz maybe 3 bags. Because CO2 comes out in irregular amounts, there is no exact amount.
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A 20oz co2 tank will on average shoot about 1000 shots. This will vary if you have a response trigger, cyclone feed or regulator on your gun.
Since they are under two inches in diameter, they do not need to be hydro-tested every 5 years. So as long as you do not break the threads or valve, they could last forever.