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A second was a unit of time measurement. Though not the smallest such unit, it was still most useful for measuring only short spans of time. According to the Fourth Doctor, 2,678,400 seconds were in a month. (TV: The Brain of Morbius)
Behind the scenes Edit
Although the Doctor doesn't specify, it seems logical to assume that he is speaking of months as measured on Earth, since he's talking to Sarah Jane Smith, a human. In fact, the Doctor's maths is precisely correct for a 31-day month.