Podcast #128: We chat with Kent C Dodds about why he loves React and discuss what life was like in the dark days before Git. Listen now.
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A standard electric stove can have 2500W elements, and most of this energy will go into a kettle sitting on the element and thus heat the water. Even a big built-in microwave won't consume much more than 1000W, and a fair percentage of that is wasted in heating the magnetron (I've found citations of 50% to 70% efficiency). So, all else being equal, a kettle on a stove will heat a body of water 2-4 times as fast as a microwave oven.

With a mug of water the convenience will likely outweigh the lost time, but if you're heating a liter or more of water then you probably want to pull out that kettle.