They can last much longer then a year.
One of the things I do that may seem over the top is.
Once the jars are sealed and cooled I wash them in hot water with a little soap then clean them up real nice and dry them.
The rings are removed and the lid is wiped with a cloth that has mineral oil on it.
Nothing worse than trying to remove a rusted ring off a jar.
Painters tape makes a good label.
Worth
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