The capacity of an AA battery can vary greatly with different brands and cell chemistries. For example, an alkaline battery can achieve a capacity of over 2800 mAh, while a zinc–carbon battery is ususally below 1700. Some AA batteries also don't have the usual 1.5V nominal voltage. Li-ion batteries are at 3.6-3.7V, while many rechargeable batteries based on nickel are at 1.2V. For a V volt, X mAh AA battery. The hours it can last will be about (V*X)/(180*5), not including the variation of actual capacity and the energy loss from internal resistance and other factors.

For example, if we have a typical 1.5V, 2000mAh alkaline battery, we can get about (1.5*2000)/(180*5) = 3.3 hours out of it.
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