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I want to buy a large pack (25kg) but i will only use 10kg to start. How long can I store the rest? How long can they be stored if crushed?

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It depends on what type of malt but assuming you are looking at base malts this should be accurate, It's directly from Briess's website referring to 2 row pale malt. Darker roasted malts will differ somewhat.

STORAGE AND SHELF LIFE Store in a temperate, low humidity, pest free environment at temperatures of <90 ºF. Improperly stored malts are prone to loss of freshness and flavor. Whole kernel diastatic and preground malts are best when used within 6 months from date of manufacture. Whole kernel roasted malts may begin experiencing a slight flavor loss after 18 months.

http://www.brewingwithbriess.com/Assets/PDFs/Briess_PISB_2RowBrewersMalt.pdf

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