You've seen these before. "For 1000 W ovens or higher, heat 2 minutes. For lower-power microwaves, heat 2 minutes and 30 seconds."
So, like...do they expect people to just know the power rating of their microwaves off the top of their head? Or are you just expected to have a general sense of whether your particular microwave heats things quickly? The latter makes more sense, but then why bother specifying numbers?