An electric fan uses around 50 watt-hours of electricity per hour.
On one level, I do understand why the author wrote it this way, but man the way popular media complicates things by using units like "watt-hours per hour" (i.e., just plain old watts....) rankles me.
Just give the power consumption (watts or kilowatts) and then if appropriate relate that to the (kilo)watt-hour unit that we see on our power bill.
This is a bit odd.... how many >5yo cars on the road have never had their wheels removed and reinstalled for a tire rotation or other basic service? Seems like the problem would be self-correcting. And if they are just learning about it now, I wonder how they discovered it was a factory problem.
Without more details, I suppose the concern may be that insufficient torque allowed the wheel studs to become damaged before it was corrected.