A Realistic Timeline for a Workplace Investigation

A straightforward workplace investigation with a handful of witnesses usually takes four to eight weeks from complaint to outcome. Complex matters, with many witnesses, a large volume of documents, sickness absence or external investigators, can take three months or more. Anything under two weeks is usually either very simple or rushed. The stages below are where the time goes, with realistic ranges; your own policy and local law may set specific deadlines, so check those first.

Stage 1: intake and triage (days 1 to 5)

Receive the complaint in writing, acknowledge it, and decide what kind of matter it is: grievance, disciplinary allegation, whistleblowing disclosure, or something that needs outside help. Decide on interim measures such as changes to reporting lines, or suspension where genuinely needed. Open the file now, with a dated note of the decision and the reasons.

Stage 2: appoint and plan (days 3 to 10)

Choose an investigator who is independent of the people involved, and write terms of reference: the allegations to investigate, the questions to answer, who decides the outcome. Draft a witness list and document list. Most delay later comes from skipping this step, because scope then grows mid-investigation.

Stage 3: evidence gathering (weeks 2 to 3)

Secure documents, emails, messages, access logs and footage early. Some systems overwrite data after a period, so this cannot wait for the interviews to finish. Log what you collected, from where and when.

Stage 4: interviews (weeks 2 to 5)

Complainant first, then witnesses, then the person the allegations concern, who must hear the allegations in enough detail to answer them. Scheduling is the main bottleneck: annual leave, shifts, companions, and people who are off sick. Allow a week for each set of notes to be written up, checked and signed. See how to take a witness statement that holds up.

Stage 5: follow-up (weeks 4 to 6)

Interviews always raise new points: a document someone mentioned, a witness nobody listed, a response that needs putting back to the complainant. Budget for a second round rather than treating it as a failure.

Stage 6: report (weeks 5 to 7)

The investigator writes up findings on each allegation, with the evidence relied on and reasons. A careful report takes several days to write and a few more to review.

Stage 7: decision and communication (weeks 6 to 8)

The decision-maker reads the report, may hold a hearing, and decides. Outcomes go to the parties in writing, with any right of appeal. If disciplinary action follows, disciplinary procedure records covers what to keep at each step.

Where the delays come from

• Sickness absence of a key party, which often needs a medical view on participation
• Scope creep from new allegations mid-process
• Waiting for IT to extract emails or logs
• Legal review of the report
• Companions or representatives with limited availability

Tell people the timeline, then keep them updated

Give the parties an expected timescale at the start and update them when it slips, even if the update is only "still in progress, next step expected by the 20th". Silence is what generates new complaints about the process itself. Record every update in the file.

Track it like a project

Put each stage in the file as a dated step with an owner, so anyone can see where the investigation stands. For disclosures with extra protections, handling whistleblowing reports confidentially covers the additional confidentiality steps.