The air conditioner consumes 7.2/8 = <<7.2/8=0.9>>0.9 kilowatt per hour.
So, in 6 hours, it will consume 0.9 kilowatts per hour * 6 hours = <<0.9*6=5.4>>5.4 kilowatts.
In 5 days, its total consumption is 5.4 kilowatts * 5 = <<5.4*5=27>>27 kilowatts.
#### 27