There are typically 52 weeks in a year [1]. This applies to both regular years (365 days) and leap years (366 days).
Here's why:
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A year is divided into periods of 7 days each, which we call weeks.
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Most years have 52 full weeks, with all 7 days falling within that week.
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The remaining 1 or 2 days (depending on whether it's a leap year) fall outside these complete weeks.
So, even though a leap year has one extra day, it doesn't add up to a whole extra week. That extra day simply doesn't fit neatly into the standard 52-week structure.