IRB Approval: What It Is and How Long It Takes

IRB timelines are one of the most common reasons a project's schedule slips — not because the review itself is slow, but because students underestimate it and plan data collection to start right after proposal defense, with no buffer.

What an IRB actually reviews

An Institutional Review Board reviews research involving human subjects to protect participants' rights and welfare — specifically checking informed consent procedures, risk/benefit balance, privacy and confidentiality protections, and (for vulnerable populations) additional safeguards. It does not evaluate your research question's importance or your methodology's rigor — that's your committee's job, not the IRB's.

The three review levels

• Exempt — minimal-risk research meeting specific federal exemption categories (e.g., certain educational research, anonymous surveys). Still requires IRB determination — you can't self-declare exempt status. Typically the fastest pathway, often 1–3 weeks.
• Expedited — minimal-risk research not meeting exemption criteria, reviewed by one or a small number of IRB members rather than the full board. Typically 2–6 weeks.
• Full board review — research involving more than minimal risk, or vulnerable populations, reviewed at a convened full-board meeting. Often the longest pathway, sometimes 6–12 weeks depending on how often the board meets and whether revisions are requested.

What actually causes delays

• An incomplete or inconsistent application — details in the consent form that don't match the protocol description are a common trigger for a full resubmission cycle.
• Submitting right before a board's meeting deadline (many full boards meet monthly, and missing a cutoff means waiting for the next cycle).
• Vague descriptions of data security or recruitment procedures.

Planning around it

Submit as early as your proposal is stable enough to describe accurately — don't wait for your proposal defense if your methods chapter is essentially final. Build at least a month of buffer into your project timeline beyond the fastest-case scenario, since first submissions frequently come back with clarification requests rather than approving outright.

Remember: EBP and QI projects are often IRB-exempt or non-human-subjects-research, unlike original research — see our guide to evidence-based practice vs research if you're not sure which category your project falls into.