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Great question!

It depends on the size. 20 minutes = 0.66 hours.

Small: 800 watts/hour 264 watts in 20 minutes

Medium: 1440 watts/hour 475 watts in 20 minutes

Large: 2000 watts/hour 666 watts in 20 minutes

To get an idea of how much this is, in terms of cost and in comparison with other appliances, you may want to check out the related link.

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