1.2kw over what time period?

Presumably on average over a year.

1.2kw is power, not energy (which would be kWh).

Watts is already a unit of energy over time. (J/s)

Aka it's a unit of power. Hence the OP asked over what time to figure out the amount of energy used..?

Surely that is the average usage over time? 28.8kWh per day?

Edit: The average household in the U.S. uses 10500kWh of power per year. 28.76kWh per day.

https://www.eia.gov/energyexplained/use-of-energy/electricit...