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How many days are there in three and a half weeks? One week has 7 days. Three weeks is 3 x 7 = 21 days. Half a week is 0.5 x 7 = 3.5 days. Add them together: 21 days + 3.5 days = 24.5 days. So, there are 24 and a half days in three and a half weeks.