Here in Austria its 38.5hrs, 5 weeks vacation, and in June and December employees receive a doubled monthly salary ("vacation money" and "christmas money").
If it's anything like Norwegian "christmas money", it's just a tax accounting rule where you pay for it the other 11 months in year.
Still a huge relief come December, as is holiday money in the summer. It probably works as a huge benefit to the economy too, although I have no evidence to back that assumption.