There are about 208 weeks in 4 years including a leap year but each year has an extra day but a leap year would have two extra days (208 weeks + 6 days about).
Including 1972, there have been 10 leap years - not including this year (2012)
There are four weeks in the month of February during non leap years.
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) ■
20 leap years.
52 weeks + 1 day (not including leap years) complete answer: 52.142857142857143 weeks
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.
Including 1908 and 2016, there are 28 leap years in that period.