The non-parole period represents the minimum time that justice requires the offender to serve having regard to all the circumstances of the offence, and it is not helpful to characterise it as 'usual' or 'unusual' by reference to its percentage relationship to the total effective sentence. The concept of a 'usual' non-parole period of between 60 and 75 per cent of head sentence has a role to play for sentences of up to about 10 years, but is not determinative.
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