"Though the effectiveness decreases as more time elapses, Emergency contraception can be taken up to hours after unprotected intercourse even though the effectiveness decreases as more time elapses."

72

Explanation:

Most of emergency contraception pills are made of levonorgestrel, and they can be taken after 72 hours or 3 days after intercourse. However, the effectiveness of the pill decreases with every hour. According to research (Paediatrics & Child Health Vol. 8, Issue 3, March 2003, p. 181–183), if taken:

There is other type of emergency made of Ulipristal acetate. This one can be taken up to 120 hours or 5 days after intercourse.

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