Leftover wine? Is there such a thing?
We do a fair amount of cooking involving wine, but with DH being a winemaker we're a little snobby, I suppose, and buy "nicer" wines so that we can drink the remainder.
However, we found it was getting a bit pricey given we now have two very hungry mouths to feed, so we stick with buying nice bottles solely to drink and (much to DH's chagrin) casks to cook with.
None of our casks last more than 3 months, so I'm not sure how long they last for, but they're still good enough for cooking down to the last drop.