There is no fixed statutory deadline in Canada that dictates how long an employer can take to complete a workplace investigation. The law imposes a standard of reasonableness rather than a specific number of days or months. What counts as reasonable depends on the complexity of the allegations, the number of witnesses involved, the availability of evidence, and the resources the employer can bring to bear. An investigation into a single incident with two witnesses will look very different from one involving systemic concerns spanning several years and dozens of potential complainants.
That said, reasonableness is not an open invitation to let matters drift indefinitely. Courts and arbitrators have consistently recognized that prolonged investigations can cause real harm to employees, particularly those placed on administrative leave pending the outcome. The longer an employee sits in professional limbo, unable to work, often barred from contacting colleagues, uncertain about their future — the more the delay itself becomes a source of legal exposure for the employer. In Alberta, tribunals assessing wrongful dismissal or constructive dismissal claims will examine whether the employer moved with appropriate diligence, communicated meaningfully with the employee under investigation, and avoided unnecessary procedural delays that compounded the harm.
Employees placed on leave during an investigation retain certain expectations under both common law and, where applicable, collective agreements. They are entitled to be informed of the general nature of the allegations against them within a reasonable time, to receive periodic updates on the status of the investigation, and to be given an opportunity to respond before any final decision is made. When employers fail to provide this basic procedural fairness, the investigation itself can be challenged regardless of what it ultimately concludes. An employer who takes many months to investigate, provides no communication during that period, and then terminates without explanation has created significant legal risk — not because the investigation was lengthy, but because the length was paired with silence and opacity.
The practical lesson for business owners is that speed matters less than structure. A three-month investigation conducted with clear communication, documented steps, and procedural fairness will withstand scrutiny far better than a one-month rush job that cuts corners or an extended inquiry that leaves the employee without any information for long stretches. If your investigation is going to take time (and some legitimately will) you should build in regular check-ins with the employee, document the reasons for any delays, and ensure that the process remains active rather than languishing on someone's desk. The goal is to demonstrate that you treated the matter seriously and the employee fairly, even if the calendar stretched longer than anyone anticipated.
When delays do become legally problematic, the consequences can be significant. Employees may claim constructive dismissal on the basis that the prolonged suspension fundamentally altered the employment relationship. Employers may find that evidence gathered late in the process is viewed skeptically, or that their failure to act promptly undermines the credibility of their stated concerns. In unionized environments, grievance arbitrators may reduce or overturn discipline where procedural unfairness — including unreasonable delay — tainted the investigation.
If the interplay between investigation timelines, employee rights, and employer obligations is something you want to understand more deeply, Binder University offers resources that explore these dynamics in detail. Feel free to share your thoughts or questions in the comments below.