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How many working days in year 2020?
Here is the detail of the calculation:
Because 2020 is a leap year, it has 366 days.
Let's remove 52 saturdays and 52 sundays. It remains 262 days.
Now, let's remove 8 public holidays that do not fall during a weekend and we obtain 254 working days in 2020.
 Here is the list of these 8 public holidays: 
 
 1. Nieuwjaarsdag : Wednesday, 1 January, 2020 
2. Paasmaandag : Monday, 13 April, 2020 
3. Dag van de Arbeid : Friday, 1 May, 2020 
4. Hemelvaartsdag : Thursday, 21 May, 2020 
5. Pinkstermaandag : Monday, 1 June, 2020 
6. Nationale Feestdag : Tuesday, 21 July, 2020 
7. Wapenstilstand : Wednesday, 11 November, 2020 
8. Kerstmis : Friday, 25 December, 2020 
And here are the 4 public holidays falling on a weekend:
1. Onze-Lieve-Vrouw Hemelvaart : Saturday, 15 August, 2020 
2. Allerheiligen : Sunday, 1 November, 2020 
3. Koningsdag : Sunday, 15 November, 2020 
4. Tweede Kerstdag : Saturday, 26 December, 2020