depends if you burn through it in full or semi as well
if i recall, my G19 could go about 2.5 mags or so with one fill at 23 degrees or so, while popping shots off at a decent rate
now a LITRE of gas...thats a different story
i would say...quite a while
ive been running 2 or 3 guns off the same can for a good long while now and still have quite a lot left
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