You savour it

Its very rich, so you cant really drink it like a normal drink, and people like to savour the taste as Zhay89 said!

Whisky? It seems to preserve the cream from going off...

I just answered another question someone asked about how long Baileys lasts and figured the same answer would help here too. The following information is pulled directly from the Baileys website: Baileys is the only cream liqueur that guarantees a totally natural product which delivers that unique, smooth Baileys taste for 2 years from the day it was made. One of the keys to achieving this is the artful blending of fresh Irish cream and aged Irish whiskey - two products that are not normally compatible. This is achieved through a combination of art and science and without the use of additives or preservatives, which results in the alcohol acting as a natural preservative for the product. How we do this must remain one of the closely guarded secrets, which contribute to producing the world's favorite liqueur. Baileys should be stored away from direct sunlight at temperature range of 41-95 degrees fahrenheit (5 – 35 degrees centigrade). You don't have to refrigerate your bottle, but we would recommend it - and it tastes even better when chilled! Fluctuating its temperature too much will cause it to go lumpy - so try and always keep it roughly at the same temperature. The storage conditions are the same for sealed or unopened bottles. If you are concerned about a bottle of Baileys - all bottles now carry a best before date - have you checked the best consumed before date on the bottle? If so, have you exceeded the date? If you cannot find a date on the bottle, have you had the bottle for longer than 24 months? You don't have to worry if you have - it is still fine to drink - it just won't taste as good as usual. We wouldn't recommend drinking it if it has gone lumpy or the mixture has separated though. The whiskey preserves the cream so well that we guarantee a totally natural product which delivers that unique, smooth Baileys taste for 2 years from the day it was made.

It doesn't last long at all in my house. Goes very fast. One day or a weekend is its shelf-life around here. :)