Peer Review Timelines: How Long Does It Take?

Peer review is one of the most time-intensive stages in scientific publishing, yet authors routinely underestimate how long the process takes. Understanding realistic timelines—and the factors that compress or extend them—helps researchers plan submissions strategically, set expectations with funding agencies, and avoid making hasty decisions when reviews are delayed.

Typical Timelines Across the Life Sciences

In life science journals, the median time from submission to first decision ranges from approximately 30 to 90 days, though outliers in both directions are common. A 2019 analysis published in PLOS ONE examining submission and publication metadata across thousands of biomedical journals found that the average time from submission to acceptance was approximately 166 days when revisions were required—roughly five and a half months. For manuscripts accepted without revision, the figure dropped considerably but remained above six weeks in most cases.

These are medians. Individual experiences vary substantially by field, journal tier, and manuscript complexity. High-impact journals such as Nature and Cell typically issue initial editorial decisions within one to two weeks—but that speed often reflects rapid desk rejection rather than accelerated review. When a manuscript clears the desk and enters full peer review, the timeline at top-tier journals can stretch to four months or longer.

The Committee on Publication Ethics (COPE), which sets widely adopted standards for journal conduct, does not mandate specific review timelines but does identify unreasonable delays as a potential ethical concern. Authors experiencing delays beyond stated turnaround windows are generally entitled to inquiry status updates. See Peer Review Ethics for a fuller treatment of reviewer obligations and editorial responsibilities.

What Determines How Long Peer Review Takes?

Several structural and circumstantial factors govern review duration:

Reviewer availability. Finding qualified reviewers willing to accept an invitation is consistently cited as the primary source of delay. The International Committee of Medical Journal Editors (ICMJE), whose recommendations are adopted by thousands of biomedical journals globally, acknowledges that declining reviewer participation is an ongoing challenge for the publication ecosystem. Editors may contact four to eight reviewers before securing two who agree to participate.

Manuscript complexity. Studies involving novel methodologies, multi-center clinical data, or cross-disciplinary content require reviewers with specialized expertise who may be scarce. A manuscript bridging molecular biology and computational modeling, for instance, may require separate reviewers for each component, and coordinating two review timelines adds latency.

Journal type and review model. The type of peer review a journal uses directly affects duration. Open peer review—where reviewer identities are disclosed—can require additional time because some reviewers decline to participate. Post-publication peer review models compress pre-publication timelines entirely but introduce their own lag structures. The Types of Peer Review page explains these models in detail.

Revision cycles. First-decision timelines are only one part of the equation. When an editor requests major revisions—which is the most common outcome at selective journals—the revision and re-review cycle adds another 30 to 90 days in most cases, sometimes more if new reviewers must be recruited for a substantially altered manuscript.

Timelines by Journal Category

Broad generalizations are possible across journal categories in the life sciences:

Rapid-communication and letters journals (e.g., EMBO Reports, Biology Letters) often advertise turnaround targets of four to six weeks from submission to first decision, and some fulfill this in practice.

Full-length research article journals with high selectivity typically take 60 to 120 days for first decision after reviewer assignment.

Mega-journals such as PLOS ONE or eLife, which evaluate technical soundness rather than novelty, have reported median review times in the range of 35 to 55 days to first decision in recent years, though eLife's transition to a publish-then-review model beginning in 2023 fundamentally altered how its timelines are measured.

Preprint servers such as bioRxiv and medRxiv, operated by Cold Spring Harbor Laboratory, allow immediate public posting without review. Authors using preprints to share findings while awaiting journal review should understand that posting does not restart or pause journal timelines—the two processes run in parallel.

When Timelines Signal a Problem

Delays become genuinely concerning in specific circumstances. If a journal has not provided a first decision within twice its stated review timeline—and has not communicated proactively about the delay—authors have standing to inquire. Most editors consider a polite status inquiry appropriate after 10 to 12 weeks if no timeline has been stated.

More serious delay patterns may indicate predatory journal behavior. Journals that charge article-processing fees and return suspiciously rapid acceptance notices (within 24 to 72 hours of submission) almost certainly have not conducted genuine peer review. The Directory of Open Access Journals (DOAJ), which maintains an allowlist of legitimate open-access publications, and Beall's List criteria (now maintained independently by researchers) provide frameworks for evaluating journal legitimacy before submission.

Conversely, extreme delays without explanation can indicate that a journal is struggling to find reviewers, has editorial staffing problems, or is simply disorganized. Authors who feel trapped in a prolonged review with no communication should consult the journal's stated withdrawal policy. COPE guidance affirms authors' right to withdraw a manuscript that has not yet been accepted, provided the withdrawal is communicated formally and promptly.

Understanding the difference between editorial review (where journal staff assess fit) and peer review (external expert evaluation) matters here—delays in the editorial stage versus the reviewer stage call for different responses. See Peer Review vs. Editorial Review for a clear breakdown of those distinctions.

How Funding and Institutional Pressures Interact with Timelines

Researchers under grant deadlines or tenure review cycles often face genuine tension between ideal journal placement and timeline constraints. The NIH, which funds a substantial share of U.S. biomedical research, does not require publication in specific journals, but many grant progress reports and renewal applications benefit from demonstrated publication output. Understanding realistic peer review timelines helps researchers plan submission strategies that align with grant cycles.

Some funding bodies, including the Wellcome Trust and certain NIH-funded programs, require open-access publication, which narrows eligible journals and may affect timeline expectations depending on which compliant journals are available for a given manuscript type.

Authors navigating these pressures should also understand that rejection with reviewer feedback—while discouraging—often shortens net time to publication by allowing resubmission to a better-matched journal without months of additional delay at the original venue. The Handling Peer Review Rejection page addresses that process directly.

What Authors Can Do to Reduce Unnecessary Delays

While much of the review timeline is outside an author's control, several practices demonstrably reduce unnecessary latency:

Submitting to journals whose scope genuinely matches the manuscript reduces the probability of desk rejection, which consumes weeks without advancing the review process. Completing all required submission components accurately and completely prevents administrative holds. Suggesting qualified reviewers—most submission systems allow or require this—gives editors a starting point and can meaningfully reduce the reviewer-recruitment phase.

For further guidance on the mechanics of the review process itself, How It Works provides a step-by-step account of what happens to a manuscript from submission through decision. Authors with broader questions about the peer review process can also consult the Peer Review FAQ.

Peer review timelines are not arbitrary. They reflect genuine intellectual labor, coordination challenges, and the structural demands of scientific quality control. Planning around realistic expectations—rather than optimistic ones—produces better submission strategy and better science.