How long does peer review take?

A colleague asks how long peer review takes and the honest answer is a range wide enough to be useless without context. PLOS ONE reported a median of 74 days from submission to first decision in 2023. Nature told submitting authors to expect “several months” and often longer for contested papers. A 2022 study of 570 journals in medicine and life sciences found median review times from 14 days at the fastest quartile to more than 180 days at the slowest, with most journals clustering between 50 and 120 days.

Those numbers are medians, not promises. Your paper can clear a fast journal in six weeks or sit at a selective one for nine months because two reviewers missed their deadline and the editor had to find a third. The useful question is not “how long” in the abstract but which stages consume the time, which of them you can shorten, and which you simply have to plan around.

What counts as peer review time?

Authors usually start the clock at “Submit” and stop at “Decision letter.” Editors count more stages inside that window, and understanding the split keeps you from misreading a silence.

Desk rejection, covered in the desk rejection guide, ends the clock before the third row. Everything after “Accept” is production, not review, but it still delays the citable version.

How long does first review usually take?

Field and journal tier move the median more than any author action after submission.

Medicine and life sciences cluster around 6 to 12 weeks to first decision at established journals. Open-access megajournals with large reviewer pools (PLOS ONE, BMJ Open) often land under 10 weeks because their business model depends on throughput. Selective clinical journals (JAMA network, Lancet family) run longer: 3 to 6 months is common when the paper survives triage.

Physical sciences and engineering show wider spread. Society journals with volunteer editors can turn a straightforward methods paper in 8 weeks. Cross-disciplinary venues with scarce reviewers for niche instrumentation stretch to 4 or 5 months. arXiv posting does not shorten journal review; it only establishes priority while you wait.

Social sciences and humanities skew longer at the median. Reviewer scarcity, smaller editorial offices, and single-blind norms that require more negotiation push many journals past 4 months to first decision. Book-length arguments and mixed-methods designs add rounds.

Computer science conference papers are a different animal: review in 6 to 10 weeks, decision once a year, and a journal version may undergo a second full review if you extend the work later.

One number worth keeping in mind: Huisman and Smits, analyzing review times across Elsevier journals, found that the time editors spend waiting for reviewers accounts for more than half of the total delay at slow journals. Your manuscript can sit “Under Review” for months when the status means “we are still waiting for Reviewer 2.”

Which delays can you actually influence?

You cannot make a reviewer finish over the holidays. You can remove the delays that happen before the editor sends invitations.

Before submission

• Fit and formatting. A manuscript returned for missing IRB language or the wrong reference style loses 2 to 4 weeks to a technical resubmission, and some journals restart the clock.
• Suggested reviewers. Three names with institutional emails, recent relevant work, and no obvious conflicts shorten the invitation stage by weeks. Names without usable addresses get ignored.
• Cover letter clarity. Editors triage from the abstract and cover letter. A gap statement that names the contribution in one sentence reduces back-and-forth.

During review

• Respond promptly to minor clerical requests. A missing figure file or copyright form can park a paper while the clock runs.
• Revision turnaround. Journals track how long authors take to revise. A 3-month revision on a 6-week deadline signals low priority and can change which reviewers the editor re-engages.

After acceptance

• Proof corrections. Treat proofs like a deadline-bearing revision. Production queues are real bottlenecks at high-volume journals.

Everything in the middle, the reviewer who agreed and went quiet, the editor juggling a special issue, the holiday closure, is noise you plan for rather than fix.

How do you read a status that stops moving?

“Under Review” for 90 days is not automatically bad. “Required reviews completed” followed by silence often means the editor is waiting on a tie-breaking third review or discussing a split decision at a monthly meeting.

Practical signals:

• No reviewer assigned after 4 weeks. The editor is struggling to find expertise. A polite inquiry to the editorial office is reasonable.
• One review in, one outstanding after 8 weeks. Common. The editor may already be chasing.
• Decision delayed after reviews are in. Often internal discussion or a statistical check. Another 2 to 3 weeks is normal.

What does not help: emailing weekly, asking to swap reviewers, or submitting elsewhere while the paper is still under active review at the first journal. Dual submission is a policy violation and a good way to burn an editor.

Planning a submission calendar with real numbers

Work backward from the date you need the citable version, not from when you want to click Submit.

1. Add production time after acceptance: 4 to 8 weeks for online-first, longer if the journal batches print issues.
2. Add one revision round even if you hope for acceptance: 8 to 12 weeks for a major revision cycle is a safe default at mid-tier journals.
3. Add first decision time from the journal’s published averages or a recent issue’s “received / accepted” dates on papers like yours.
4. Add 4 weeks of buffer for reviewer delays you cannot see.

If you need a citable DOI by March and the journal’s median is 16 weeks to first decision with a history of major revisions, Submit in August, not November.

Reading recent tables of contents helps more than the journal’s marketing copy. Pick five papers in your article type and note the received, revised, and accepted dates in the footer. The median of those five is a better forecast than a generic FAQ.

When the timeline itself is the finding

Long review is not only waiting. It changes strategy.

A fast-turnaround venue establishes priority for a incremental result while a slower, higher-prestige journal considers the fuller story. A preprint on arXiv or bioRxiv decouples priority from journal speed, which is why fields with long review adopted preprints first.

For grant renewals and job committees, a paper “under review at Journal X” carries weight only if the timeline is plausible. Listing a selective journal with a 9-month median when you submitted last month reads as optimism, not progress.

What to do while you wait

Waiting is not passive. The productive uses of a long review window:

• Run the checks reviewers will run anyway. Citation hygiene, statistical consistency, and methods reproducibility audits catch the failures that turn a revise into a reject on round two.
• Prepare the revision infrastructure. Collect the extra analyses reviewers are likely to request so a 6-week revision deadline does not become a scramble.
• Write the response letter skeleton when reviews arrive, not after you finish the edits. Mapping each comment to a location in the manuscript prevents orphaned requests.

Tools like Fukuro run manuscript-level checks (claim-evidence alignment, reference integrity, statistical consistency flags) in minutes. They do not shorten editorial queues. They shorten the revision cycle that comes after the queue, which is often where another three months disappears.

The short planning table

Peer review duration is mostly other people’s calendars. Treat the median for your target journal as a planning input, submit with the formatting and ethics package complete so you do not restart the clock, and use the waiting months to make the revision you will almost certainly be asked for shorter than the review you are waiting on.