How do I calculate how long a battery will power an LED?

How do I calculate how long a battery will power an LED?
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Answer :

answer:AA Alkaline batteries have between 1800 and 2500 mAh and C Alkaline batteries up to 8000 mAh. mAh/mA = hours Calculation is batteries mAh divided by load 200 mA, for AA 9 to 12 hours and 40 hours for C.
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