A week was a period of time equal to seven days. On Earth, the individual days of the week were respectively known as Sunday, Monday, Tuesday, Wednesday, Thursday, Friday, and Saturday. Within the period of week was the weekend, which saw the end of one week and the beginning of another.

A galactic week was used by the Daleks. (COMIC: Return of the Daleks)

The young Jeanne-Antoinette Poisson remarked she had not seen the Tenth Doctor in weeks when he visited her in 18th century France. (TV The Girl in the Fireplace)

The members of LINDA met every week on Tuesday. Bliss, Bridget Sinclair and Colin Skinner were absorbed at different times after some weeks had passed. (TV: Love & Monsters)

From the perspective of Tommy Brockless, who spent only one day awake per year after being taken to be cyrogenically frozen by Torchwood Three in 1918, only three weeks passed between the end of World War I and the beginning of World War II. (TV: To the Last Man)

The Human-Hath War on Messaline lasted seven days, or "just a week" as Donna Noble put it. (TV: The Doctor's Daughter)

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