Lawyer Sonja Cooper estimates it takes up to seven years on average for claims to be settled.
The apology came 50 years after the abuse, and behind closed doors.
Dr Selwyn Leeks led a regime of torture and physical and sexual abuse at the Lake Alice Psychiatric Hospital in the 1970s.
The Family Proceedings Amendment Bill unanimously passed its first reading in Parliament.
About one-fifth of boys at Marylands School reported abuse, although the Commission believes the true number to be much higher.
The Auditor-General's office is urging the agencies to address the issues urgently.
Members of the Mongrel Mob, Black Power, Filthy Few, Kuki Squad, Tribal Huks, Tribesmen, Stormtroopers, King Cobras and 501s are attending.
But some organisations are stepping in to help all victims of abusive relationships.
The breach was discovered months ago but officials kept it from the public.
