Depends on how you bottle. If you used a sanitized tube that ran from the faucet, to the bottom of a sanitized bottle (or used a filling wand/beer gun), then filled to the top of the bottle, then removed the filling tube/wand/beer gun from the bottle, then let the foam creep up to the cap (so the air is removed), then capped it, I'd say it should last months. This is how homebrewers cap their bottles.
I assume you talking about using real bottles with a capper or swing top bottles. If you're talking about twist off bottles, then I guess it depends on how tight the seal is on that bottle, as to whether or not the beer might go flat.
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Sometimes when I reflect back on all the beer I drink I feel ashamed.
Then I look into the glass and think about the workers in the brewery
and all of their hopes and dreams. If I didn't drink this beer, they might
be out of work and their dreams would be shattered. Then I say to myself,
"It is better that I drink this beer and let their dreams come true than
be selfish and worry about my liver."
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