Major public inquiries routinely run for years and report long after the events they examine. The delay is mostly produced by procedural fairness rather than by inefficiency.
Disclosure comes before anything else
An inquiry begins by gathering documents from every organisation involved, which can mean millions of emails, reports, minutes and messages held in incompatible systems.
Each document must be collected, deduplicated, reviewed for relevance and checked for material that cannot be published, such as personal data or genuinely sensitive security information.
That review happens before witnesses can be questioned properly, because effective questioning depends on knowing what the record contains.
Anyone who may be criticised has rights
Inquiries operate under rules requiring that a person facing potential criticism is told what the criticism is and given a fair chance to respond before it is published.
In practice this means sending draft findings to affected individuals and organisations, receiving detailed representations, and considering each one before the report is finalised.
Where an inquiry criticises dozens of parties, that process alone occupies months and can generate further evidence that reopens earlier questions.
Legal representation multiplies the participants
Core participants each instruct their own lawyers, and every one of them may question witnesses, make submissions and challenge procedural decisions.
Hearings therefore move slowly, since a single witness may be examined by counsel to the inquiry and then by several other legal teams in turn.
Disputes over disclosure, redaction and scope are litigated during the inquiry, occasionally in the courts, which pauses everything else.
Parallel proceedings force sequencing
Where criminal investigations or prosecutions arise from the same events, an inquiry may have to defer parts of its work to avoid prejudicing a trial.
Regulatory action and civil claims raise similar problems, and the inquiry has no power to compel other processes to hurry.
Splitting the work into phases is the usual solution, which produces interim reports and extends the overall timeline.
Slowness has real costs and some benefits
Witnesses age, memories fade, organisations restructure and the officials responsible move on, so accountability weakens as time passes.
Bereaved families and survivors, who are often the reason the inquiry exists, wait years for findings that were supposed to answer their questions.
Against that, findings produced carefully enough to survive legal challenge carry weight that a rapid report would not, and recommendations rejected as unfair change nothing.