There's little chance the brothers behind a horrific string of sexual assaults at Christchurch's Mama Hooch bar will leave prison early

A Christchurch District Court judge yesterday sentenced Roberto Jaz to 17-years behind bars for offending against eight women.

Danny Jaz received 16-and-a-half years for crimes against 19 women.

Auckland University of Technology law professor Kris Gledhill says neither will be eligible for parole until they've served half their sentences.

He says a parole board may consider a person too risky to release, if they continue to deny or minimise their offending.