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From what I understand at the moment for dew heaters usually run at 45W which 3.75A @ 12V (I=P/V). On a 26AH rating battery this would be 6.93 hours. So in short only 3.47 hours per night at full power.
Condition that may influence the reading are switch on and off time for the dew heater, this would depend on a whole bunch of parimeters. I am designing my own dew heater to be automatically variable this could complicate matters as it would automatically switch on an off based on ambients (work in progress). I have never really checked the operation for other dew heaters though.
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