I have never used it. This is used with Buffer. From help:
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The stale after option is typically used with DB sources where there is no simple timestamp on the original data. Instead one specifies how old the QVD snapshot can be to be used. A stale after clause simply states a time period from the creation time of the QVD buffer after which it will no longer be considered valid. Before that time the QVD buffer will be used as source for data and after that the original data source will be used. The QVD buffer file will then automatically be updated and a new period starts.
If no option is used, the QVD buffer created by the first execution of the script will be used indefinitely.
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To understand better, learn about buffer from help again.
