5478 or 5479 days - depending on how many leap years the 15-year span contains.
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27 years, 4 months, 15 days.
It has 5475 days not counting the leap years between those 15 years.
15277 / 365.24 = about 41.8 years
365 x 12 = 4,380 366 x 3 = 1,098 4,380 + 1,098 = 5,478 5,478 days in 15 years
Assuming that any one of these years is a leap year, then 4 years 15 weeks is equal to (365 x 3) + 366 + (15 x 7) = 1566 days.