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To determine how many hours are in seven days, you need to know how many hours are in one day. There are 24 hours in a single day. Therefore, to find the total number of hours in seven days, you multiply the number of hours in one day by the number of days:

24 hours/day × 7 days = 168 hours.

Thus, the correct answer is 168. This calculation demonstrates the straightforward multiplication that accounts for each day of the week.