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From my quick research, the time is 38 weeks (266 d). The value of 40 weeks (280 d), which is also often quoted, is a result of the uncertainty with which it is commonly found that the exact date of conception can be established. The additional 2 weeks is thus simply a practical response to this uncertainty and represents the time from first day of the last menstrual period to an 'average' point of likely conception, i.e. roughly half of a complete menstrual period.

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