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We have a duel control one on our bed, my half has never been used but his half is used every night from about end of October to end of April.
He switches his half on as he retires for the night, then gets his pyjamas on, cleans his teeth and generally faffs around for about ten minutes before hopping into bed. He says that's enough to take the chill off, although on the coldest nights he leaves it on while in bed reading for about half an hour. It could be left on all night on low.
Its machine washable and is a bit like a mattress protector to look at.