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How many working days in year 2066?
Here is the detail of the calculation:
Because 2066 is not a leap year, it has 365 days.
Let's remove 52 saturdays and 52 sundays. It remains 261 days.
Now, let's remove 7 public holidays that do not fall during a weekend and we obtain 254 working days in 2066.
 Here is the list of these 7 public holidays: 
 
 1. Nowy Rok : Friday, 1 January, 2066 
2. Święto Trzech Króli : Wednesday, 6 January, 2066 
3. Poniedziałek Wielkanocny : Monday, 12 April, 2066 
4. Święto Konstytucji : Monday, 3 May, 2066 
5. Boże Ciało : Thursday, 10 June, 2066 
6. Wszystkich Świętych : Monday, 1 November, 2066 
7. Dzień Niepodległości : Thursday, 11 November, 2066 
And here are the 6 public holidays falling on a weekend:
1. Niedziela Wielkanocna : Sunday, 11 April, 2066 
2. Święto Pracy : Saturday, 1 May, 2066 
3. Zielone Świątki : Sunday, 30 May, 2066 
4. Wniebowzięcie Najświętszej Maryi Panny : Sunday, 15 August, 2066 
5. Pierwszy dzień Bożego Narodzenia : Saturday, 25 December, 2066 
6. Drugi dzień Bożego Narodzenia : Sunday, 26 December, 2066