Quote from jim mickPerhaps.
That can't be right (not in a morally right/wrong sense).
Maybe it's my naivete, but is it at all pragmatic to have these maximum sentence lengths?
It's not correct. The Norway system has a maximum guaranteed sentence of 21 years. After that they conduct a review and can hold you for 5 years (until your next review) if you're still judged to be dangerous.