Cheap wines are made and sold to be drunk immediately. They will not improve with age. You could keep a bottle of cheap red or white in a drinkable condition for about three years, but it won't be as good as the day you bought it.
I don't think you can keep it for much longer than you would an open bottle. I generally drink it within a day or so.
HOW LONG DOES UNOPENED MULLED WINE KEEP?
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If the bottle is unopened then it can last as long as you want it to, but I personally wouldn't drink it after having for more than 9 months or so.
If you open the bottle, you need to keep it refrigerated and it will last for a month. If it is an unopened bottle it should last for about a year :)
Potentially centuries if it is good quality originally.
It should last indefinitely if kept in a cool, dark place.
It was last for decades if unopened.
I have a bottle of Cointreau that was first opened 16 years ago and it still tastes fine!
Chardonnay is good for about 7 years unopened.
Alcohol does not expire when it is unopened.
My research showed that an unopened bottle of Pimm's would last for a year or two. Once it is opened, it starts to lose flavor after a week or so.
As long as it is kept cold, indefinitely.
Nair is said to keep hair from growing back for a month or more. In an unopened bottle, Nair will last indefinitely. Once opened it will need to be used up.