As most fridge's power consumption varies depending on make/model/size/setting/surge peak/frequency of use (open/close) and even the ambient temperature, it is difficult for anyone to determine the runtime as some fridge may have the air compressor on more frequently than others. Once the set temp is reached, the fridge may not require the full wattage (average household fridge consumes around 800W), but drops down to 100-150W to retain the temperature setting. Therefore, the runtime could run longer than 1+ to 10+ hours but we cannot give you an exact/definite runtime number.