Nobody in the country thinks it's at all a possibility for the foreseeable future. He won't be released - the man is behind the deadliest peacetime crime in Norway. Even if he sincerely repents at some point, he'll have to spend many more years behind the bars with perfect behavior for a release to be considered.

If he repents the murders, if he renounces his ideology, and if he spends a couple decades as a repentful man would, he will, just maybe, get released when he's old, frail and not expected to live long.