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I thought its the lower voltage you use in the US, so electric kettles take double or more the time to heat up the water than in europe
current draw would drive boil time, not the voltage
power determines the boil time. power is voltage times current. its usually said current kills and not voltage, which is what you're thinking. (which is not even entirely correct)
Overall power would determine boil time, but the issue is that at 120V you need twice the current of 240V to deliver the same power. The wiring in American homes isn't rated to handle the amount of current it would require to deliver the same amount of power as most 240V electric kettles.
There's a relation between voltage and current you don't quite understand. They both matter. If you're interested check out ElectroBoom, learnelectronics, and Great Scott on YouTube. Watch enough and you'll get it.