I’m in Australia, generally, we have cooking instructions and microwaves that talk about wattage and time. Never duty cycle.

Eg a sauce packet says 600w 30sec. Press power button until 600w and put it in 30 seconds.

I know there’s duty cycles, you can hear them. I don’t know if that’s how it’s converted as a fraction of the 1500 watt maximum (40% duty cycle = 600w) but you hear it turn on and off most on the defrosting preconfigured buttons.

Either way, I wouldn’t be surprised if it’s all just the same underneath with regional translations.