I'd like to ask a similar question, if I may do so without highjacking the thread too much.

I also am looking to know how long a bottle of whiskey can last, but my concern is far more short term.

I was given a set of antique liquor decanters for my birthday, and couldn't help but clean one up and use it.

I only filled it with a low quality whiskey, reason being the cork had deteriorated from the glass stopper and I removed it.

So, my decanter sits on an antique jam cupboard that is set in front of a window, and the ornate stopper, with a slender stem which once held the cork, is no doubt letting in quite a lot of air.

I'm inclined to drink whiskey quite often, and so I'm not intending to "store" my whiskey on the jam cupboard.

Nevertheless, I was wondering if anyone could tell me how long whiskey could last in such a state.

I'm only worried that it could go bad in the manner of weeks. If it is still possible for it to last a few months, then I'll have no problems whatsoever.

Thank you for your time.