It will last as long as the bottle holds up.
An Armagnac is a variety of brandy made in the region of Armagnac, a region of France.
The type of bottle is called a bocksenbutal. It is a name given to bottles that take on a circular shape through the body of the bottle. This shape of bottle is popular in Portugal and Germany.
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Marie of Armagnac was born in 1420.
Bonne of Armagnac was born in 1393.
Bonne of Armagnac died in 1430.
Joan of Armagnac died in 1387.
Anne of Armagnac was born in 1402.
About a week.
Anne of Armagnac died in 1473-03.
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 :)