52
1 million
1 year = 52 1/7 weeks (not counting leap years) 21 years = 1095 weeks (with some days left over if you are counting leap years) ■
Including January and March, it's 13 weeks. In regular years it is 12 weeks and 6 days, and in leap years it is exactly 13 weeks. If referring to the period from the beginning of January to the beginning of March or from the end of January to the end of March (or middle to middle, etc.), it is eight weeks and three days in regular years and eight weeks and four days in leap years.
2609 weeks.
52 weeks + 1 day (not including leap years) complete answer: 52.142857142857143 weeks
20 leap years.
It depends on how many leap years are included. There would be 2 on average, but depending on when you start counting there might be three. If there are two leap years, there would be 521 weeks and 5 days.
560,340.
67
There are 365 days in a year, and 7 days in a week, so there are 52 weeks in a year with one day left over. If it is a leap year, the same number of weeks, but with two days left over. Notice that with the pattern of leap years, and not including the exempt century years, there are exactly 1461 weeks in any 28-year period.
Approx 1983 weeks. The exact number will depend on the number of leap years in the interval.