Realise this is a how long is a piece of string question.
But honestly, what happens once the abuser gets unsupervised contact with his children?
Currently going through proceedings with a horribly abusive ex and he is hoping for contact to be lifted from supervised to unsupervised and has requested that I am the only person who does handovers with either him or his new partner.
I feel sick at the thought of it.
I've seen very telling little insidious traits of his behaviour during supervised contact and have no doubt whatsoever in my mind this will carry on when he gets unsupervised.