The rest period will last from December 31 to January 4 inclusive.

Weekends:

December 31 (Saturday) - additional day off
January 1 (Thursday) is a holiday and non-working day;
January 2 (Friday) - additional day off;
January 3 (Saturday) is a day off
January 4 (Sunday) is a day off.

Thus, the country's residents will have five days of continuous rest.