The last stage of a normal wash cycle is a spin to press most of the water out of the clothes. Modern washers have sensors (usually for weight) to measure when the intended amount of water has been removed from the clothes. If this takes longer than expected, it keeps running until it’s done.
Modern dryers have humidity sensors which check whether (nearly) all the moisture has been removed. Similarly, if this takes longer than expected, it keeps running until it’s done.
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