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It really doesen't matter the voltage when you're dealing with wattage. So...
10W * 24Hrs = 240 Watt Hours
240 WH * 30 Days = 7200 Watt Hours or 7.2KWh
Little impact on a power bill, considering an apartment can use between 500KWh up to and including 2.4MegaWatt hours monthy(yes, I've seen it)
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