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It depends how badly 'frosted' it is but my old fridge would take about 10min with some hot water and a scraper. It's hardly breaking the bank with elec costs for me so I imagine someone running two dehumidifiers would laugh at the opportunity to use up an extra 0.05p worth of juice.
Also modern freezers defrost while they're on automatically.
You can defrost a freezer with it still turned on.