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Possible Duplicate:
Shelf life of spices

Suppose I grind the mustard + cumin + pepper seeds and keep them covered in a bowl, after how much time should I expect them to lose their flavor?

Authoritative answers with references to some credible sources will be appreciated.

EDIT 1:

The packed powdered/ground spices we get in shops don't taste the same as freshly ground. Hence my question.

EDIT 2:

Info required for spices namely: Cumin, Mustard, pepper. and Garlic/Ginger too.

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