For Christmas Norid will have the following opening hours:
24 December: closed
25 December: closed
26 December: closed
29 December: 9 am - 3 pm
30 December: 9 am - 3 pm
31 December: closed
1 January 2015: closed
The zone file will be generated as normal through the holidays. The publishing times can be found here.
Merry Christmas and a Happy New Year!