Other factors affecting case length included the speed with which those involved prepared for hearings and the availability of lawyers and witnesses.
However, Ms Logie dismissed the minister's explanation and labelled the situation "unacceptable".
She said changes to the court system and cuts to legal aid had made it more difficult for cases to move through the courts. "The Government has made things worse for victims of sexual violence The changes they have made are slowing the system up."
Victims of sexual violence were retraumatised by long delays between charges being filed and the case being resolved, she said. "There is a permanent sense of insecurity and having to keep on dealing with it."
Ms Logie said the court issues were in contrast with National's support of funding for sexual violence social services. Courts acting deputy secretary Linda Biddle said the average age of trial cases was coming down - two months less by the end of 2014 compared with April 2013.
Ms Biddle said there had been an emphasis over the past two years on pushing through old cases first.
"Being involved in a criminal case is a distressing time for everyone, especially victims. We strive to keep everyone's time in the criminal system to a minimum."
Over the same period, the number of jury trials in sexual violence cases fell from 448 to 380.
Police prosecutions manager Inspector Gary Allcock said changes to the law through the Criminal Procedure Act saw more cases resolved before going to jury trial.
"In many cases this has led to earlier guilty pleas without having to subject victims to the stress of a trial." He said a decline in the crime rate could also explain fewer cases in the courts.