It depends on several factors. The main considerations are the policies of the individual banks and the longevity of the particular plant species. Presumably, most banks would keep their seeds as long as they remained viable (able to be planted and to germinate). While some seeds can only remain viable for 20 or 30 years, some can last much longer. The oldest known seed to be successfully planted was 2,000 years old, though it was not kept in a seed bank.
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