There are 1,461 days in 4 years. This calculation includes one leap year. A typical year has 365 days, but a leap year has 366 days. Since 4 years include one leap year, the total number of days is calculated as follows: (3 years × 365 days) + (1 year × 366 days) = 1,095 + 366 = 1,461 days.
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