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A 47-year-old man is reviewed in the cardiology clinic after a single episode of loss of consciousness while sitting at his desk. There was no warning and no palpitations, and he came round within a minute. His colleague saw no jerking, he did not bite his tongue and he was not confused afterwards. Examination, electrocardiogram, echocardiogram and a 48-hour Holter recording are all normal, and no cause has been found. He holds a heavy rigid vehicle licence and drives a delivery truck for a living. Which one of the following periods must elapse from the episode before he may drive his truck again?
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