That, my friend, purely depends on which year we are talking about. A year is the period of time that it takes for a planet (e.g., Earth or Mars), to make a complete revolution around the Sun. For an Earth year, it takes planet Earth approx. 365 days to complete its revolution around the Sun as per the Georgian Calendar. Now, an Earth week is supposed to be 7 days and this makes the total number of weeks in a year equal to 52 complete weeks and a 1/7 week.

However, when calculating precisely, the revolution time of planet Earth is 365.2425 days or 365 days 5 hours 49 minutes and 12 seconds. This makes the Earth year 365 days and about 10.8 minute less than ¼ of a day. This tells us that every year has about a quarter of a day extra, which later sums up to a full 24 hours day in the fourth year. That year is called leap year and has 366 days. In a leap Earth year, we will have 52 complete weeks and a 2/7 week.

The fixation of a 7 day long week is however an interesting story as it leads back to Babylonians and Bible. The Babylonians celebrated the 7th, 14th, 21st, and 28th as holy days, counting from every new moon. This pattern repeated and is said, to be transformed into current weekly pattern. In linkage, the seven-day week was mentioned in the Bible as the seventh day was said to be of rest in fourth of the Ten Commandments, in the Book of Exodus. In the Book of Genesis it’s said that the heavens and the Earth was created in six days and God rested on the seventh day. These laid the foundation for a week of six working days and one holiday.

However, when calculating precisely, the revolution time of planet Earth is 365.2425 days or 365 days 5 hours 49 minutes and 12 seconds. This makes the Earth year 365 days and about 10.8 minute less than ¼ of a day. This tells us that every year has about a quarter of a day extra, which later sums up to a full 24 hours day in the fourth year. That year is called leap year and has 366 days. In a leap Earth year, we will have 52 complete weeks and a 2/7 week.

The fixation of a 7 day long week is however an interesting story as it leads back to Babylonians and Bible. The Babylonians celebrated the 7th, 14th, 21st, and 28th as holy days, counting from every new moon. This pattern repeated and is said, to be transformed into current weekly pattern. In linkage, the seven-day week was mentioned in the Bible as the seventh day was said to be of rest in fourth of the Ten Commandments, in the Book of Exodus. In the Book of Genesis it’s said that the heavens and the Earth was created in six days and God rested on the seventh day. These laid the foundation for a week of six working days and one holiday.