78, if you do not overlap.
Two years is about 52.2 fortnights.
2 years = 52.1494708995 fortnights.
There are 182 fortnights in seven years.
4 years = 104.2989417989 fortnights.
5
3 years = 1095 or 1096 days = 1095/14 or 1096/14 fortnights = 78.2 or 78.3 fortnights.
17 years is 443.51 fortnights.
About 104.36 fortnights in four years.
130 fortnights in 5 years.
394
its really 423 fortnights = 42 days
14 days (2 weeks) A fortnight would be 14 days. So, 3 fortnights would be 42 days.
about 22 fortnights
There are 2 weeks in a fortnight, so there 16 weeks in 8 fortnights.
There are two full fortnights in February, and one extra day if it is a leap year.
A decade lasts on average almost 261 fortnights (almost 522 weeks).
A fortnight is two weeks, so 8 weeks would be 4 fortnights.