Well personally I wouldn't do it but perhaps 3 days maximum -- but as the
air space above the wine increases then so does the deterioration of the
wine. Have you ever tried to drink the remnants of a glass of wine left out
from the night before! Ugh ----- warm , flat and disgusting.
I would suggest that if you want to breach a one gallon bottle without all
the fuss of corking and labelling then have 6 empty wine bottles and six of
those little plastic caps that you get with some inexpensive wines --- you
can also buy them from you local Home brew shop. If the bottles are clean,
even without sanitisation, the wine will keep for a couple of weeks or even
more.
HTH
( Oh -- 6 bottles from a 1 gal imp)

--
Trevor A Panther
In South Yorkshire, England
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"Rob M" > wrote in message
om...
> I was thinking of bottling a batch of wine in one gallon bottles. Once
> a bottle is opened, how long do I have to drink it before it becomes
> oxidized?