Corrections Regulations 2005, reg 152, Schedule 7
If the charge isn’t laid within seven days after the relevant prison officer became aware of the thing that you’re supposed to have done or not done, you can apply for the charge to be dismissed. The charge should be dismissed if it was unreasonable to take so long to lay the charge.
If the hearing hasn’t taken place within 14 days of the charge being laid (or 21 days if there’s been an adjournment – which is where the hearing is ordered to be put off for a time), then you can apply for a discharge. The charge should be dismissed if it was unreasonable for the hearing to take so long to take place.
If the hearing has been adjourned because you’re facing drug or alcohol charges and you need to have a urine or hair analysis, then those time limits don’t apply.