Guide for employers
How long does a workplace investigation take?
There is no fixed timeframe: a workplace investigation can take anywhere from days for a single, simple allegation to months for complex matters with many allegations and witnesses. The biggest factors are the number of allegations and witnesses, people’s availability, the volume of evidence, and how quickly responses come back. Delay carries real risks, so plan the timeline at the start and manage it.
What affects how long an investigation takes?
| Factor | Why it matters |
|---|---|
| Number and complexity of allegations | Each allegation needs evidence and a finding. Allegations spanning months or years take longer. |
| Number of witnesses | Every interview needs scheduling, conducting and recording, and may lead to further witnesses. |
| Availability | Leave, illness, shift rosters and fly-in fly-out or drive-in drive-out swings can delay interviews. |
| Documents and data | Emails, messages, CCTV or system records can take time to collect and review. |
| Response time | The respondent needs reasonable time to respond, and new matters raised may need follow-up. |
| Representation | Union or legal representatives may need to be consulted on timing. |
| Scope changes | New allegations during the investigation may need new notice and more time. |
Why is delay a problem?
- Wellbeing. Waiting is stressful for complainants and respondents. Queensland’s psychosocial hazards Code lists poor organisational justice as a hazard.
- Evidence. Memories fade and records may be lost.
- Fairness. Long periods of suspension or uncertainty can be unfair to a respondent who is later cleared.
- Disruption. Teams split into camps, productivity drops and rumours spread.
How can an employer keep an investigation on track?
- Act promptly once a complaint is received, including interim safety measures where needed.
- Set clear terms of reference with a realistic timeframe.
- Tell the parties the expected timeline and update them if it changes.
- Collect documents early and identify witnesses up front.
- Give a single contact person authority to make decisions about scope and access.
- Use an external investigator if internal people do not have the time.
How long does a BION Partners investigation take?
We deliver prompt, thorough and objective investigations. It depends on the size and complexity of the matter. Many investigations are completed within about a week; larger or more complex matters take longer, and we’ll give you a timeframe at the start. The agreed timeframe is set out in the terms of reference.
General information only. This page explains the law in general terms and is not legal advice. For advice about your situation, speak with a lawyer.
Sources
- WorkSafe Queensland: Managing the risk of psychosocial hazards at work Code of Practice 2022
- Queensland Public Sector Commission: Managing workplace investigations, a practical guide (2024)
Checked 22 October 2026. Laws and guidance change; check the source before relying on it.