Seventy-two hours is three days. Three weeks is 21 days.
21 + 3 = 24
There are twenty-four (24) days in three weeks and seventy-two hours.
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There are 504 days in 72 weeks.
72 days / 7 = 10.29
72 days 4 hours.
72 hours.
Heroin takes approximately 72 hours (3 days) to leave your system.