How many days are in a leap year?

A leap year consists of 366 days, which is one additional day compared to a standard year that has 365 days. The extra day is added to February, which typically has 28 days, resulting in February having 29 days during a leap year. Leap years occur every four years to help synchronize the calendar year with the solar year, or the astronomical year, which is about 365.25 days long. By adding this extra day to maintain alignment with Earth's orbit around the sun, the calendar becomes more accurate. Therefore, in a leap year, the total number of days is 366.