That's like asking what my fuel milage will be not knowing how you drive, where you drive, or what load is in your vehicle. More info would help but it's still a guess.
So with that said my answer would be just am\ambiguous. One one battery not very long and on two batteries a little longer.
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Marshall
2012 Laredo 303 TG
2010 F250 LT Super Cab, long bed, 4X4, 6.4 Turbo Diesel
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