Huh, in Norway the normal resignation period is 3 months. Maybe long, but goes both ways, so you always know your job isn't swept away from under your feet one day.
That's incredible. How are job tenures in Norway? Where I am, lots of people stay 14 + or - 4 months typically.
Where I worked before the avg employee had worked there for about 3-4 years, and that number was heavily influenced by the new hires not having had the opportunity to work that long yet, even. I feel that's true for many of my friends as well, those having switched a few jobs since graduating have stayed avg ~3 years.
And it's 3 or 6 months for being fired.
Note that if both parties agree it can end sooner, they can also fire you straight up and forbid you working if they don't want you to but they still need to pay your salary for the entire notice period.