My thought is, if possible the plant needs to dry slowly under a controlled environment. If the plant is fully hydrated at harvest in theory it will dry uniformly or somewhat evenly. If water is withheld for a week the plant will have already begun to dry and that will cause the plant dry unevenly. A week without water will stress the plant as well. A day, maybe two without water should not hurt and will slightly speed up the drying process, but that may be counterproductive to the low and slow dry method.