He had previously intimated he would defend the charges, and today the court was told there were further complainants and further witnesses likely to extend the trial to five weeks from the initial estimate of four weeks.
Matamata was arrested following a lengthy investigation by Immigration NZ and the police.
Allegations made by victims include not being paid for work completed, having their passports taken, and being subjected to physical assaults and threats.
It is claimed the alleged offending had been ongoing since the 1990s across Hawke's Bay.
Alleged victims also claim that their movements were closely monitored and controlled, and there were restrictions on where they went and who they had contact with.
Matamata was remanded on continued bail for a trial scheduled to start on February 10 next year.