According to the National Weather Service (NWS), there are 12 months in a year. This means that in any given year, there is one month with 31 days and another month with 30 days.
However, when people think about how many days are in six months, they tend to only count the number of full weeks. The problem with this approach is that it doesn’t account for partial weeks or holidays like Independence Day which falls on a Wednesday in 2018 and 2019 but not 2020 because it’s a Sunday. When we account for all three types of weekdays – Monday through Friday, Saturday and Sunday – we find that there are actually 146 total weekday opportunities over six months: 114 Mondays through Fridays plus four Saturdays and 10 Sundays. That means that there are 10.5 Mondays through Fridays, 4.5 Saturdays and 0 Sundays in six months.
However, when we count just the working days – i.e., Monday through Friday – there are only 101 total opportunities for workdays over six months: 77 Mondays through Fridays plus four Saturdays and seven Sundays. That means that there are 7.75 Mondays through Fridays, 3.25 Saturdays and 0 Sundays in six months which rounds to 144 total weekday opportunities over 6 months (i.e., 12 full weeks with 9 weekends per 6-month period).
The correct number of weekday opportunities is thus 146 (114 + 4 + 10) rather than either of the incorrect options people typically offer (101 or 144).
Number of Opportunities for Working Days = 77 Mondays through Fridays + 4 Saturdays + 7 Sundays = 101 days over 6 months (i.e., 12 weeks with 9 weekends)
Number of Opportunities for Full Weeks = 114 Mondays through Fridays + 10 Sundays = 124 days over 6 months (i.e., 15 weeks with 8 weekends)
Number of Opportunities for Total Weekdays = 146 Monday-Friday opportunities plus 4 Saturday opportunities plus 10 Sunday opportunities = 160 total weekdays over six months (i.e., 20 full weeks with 0 day offs)
So, the correct answer would be 101 weekday opportunities over six months. There are 100 full weekdays plus one day where there is no work (i.e., Saturday).