In 2020 there will be exactly 52 Sundays. Most years have 365 days, but a leap year has 366 days. This adds up to 52 weeks (each week being exactly 7 days) PLUS 1 or 2 more days. The year 2020 has exactly 366 days.
How many days are there in the year without a Sunday?
Normally we have 104 weekend days. We know that a normal year has 365 days, or 52 weeks plus one day, and each week has two weekend days, meaning there are about 104 weekend days in each year. While we have 366 days in a leap year, this adds one more day to the year.
How many days is there in a year without a Saturday and Sunday?
Whatever your reason, we have your number. In 2021 there will be 261 working days. 2021 is not a leap year. So the total number of days in the year is 365.