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In a healthy person, the acclimatisation takes a period of about two weeks. Cold accamalization is slower and the process is faster in hot accamalization. So time can vary in range for cold accamalization in human beings.
Other factors like body fat, age and medications also affect the cold accamalization. Like the person heaving more body fat will accamalize cold temperatures soon. And as a person ages, the body response to cold temperatures is delayed or reduced.
