Johannes Jacobus Steyn, dubbed the "Sunday Rapist", was sentenced to five life prison terms and 175 years on Wednesday.
On Tuesday, he was found guilty on 33 charges, including murder, in the High Court sitting in Alberton.
Judge Sita Kolbe found him guilty on all but four of the 37 charges brought against him.
Two of those were changed from rape to sexual assault and one was changed from murder to culpable homicide.
The abductions took place between 2008 and 2011 and the girls were aged between 11 and 18.
Among them was 16-year-old Louise de Waal.
