The dismissal of an appeal seeking to change the nine month home detention sentence for a teen rapist, is being described as nuanced and complex.

Jayden Meyer was convicted of raping four 15-year-old girls and sexually violating a fifth when he was 16.

Massey University adjunct professor of law, Chris Gallavin, says the judgement is 128 paragraphs long.

He told Mike Hosking the Crown's appeal was filed late.

Gallavin says the Crown did a complete 180, having never asked for Meyer to receive imprisonment during initial proceedings.

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• Women's Refuge CEO: Victims have been let down by system in teen rapist case
• The Crown's appeal in the sentencing of teen rapist Jayden Meyer has been dismissed