For a typical engineering deliverable on an AEC or EPC project, one review cycle — transmittal to returned comments — is contractually allowed 10 to 21 calendar days, and most teams use all of it. But the single-cycle duration is the wrong number to optimize. The number that determines your schedule is cycles per document: a deliverable that needs three "revise and resubmit" round trips consumes two to three months even when every individual review lands on time.
So the useful question isn't "how do we review faster?" — it's "how do we need fewer reviews?"
| Metric | Healthy | Warning Sign |
|---|---|---|
| Review cycles per document | 1–2 | 3+ routinely |
| First-pass approval rate (A or B code) | above ~70% | below 50% |
| Comment closure time (raise → verified closed) | days | weeks, or unknown |
| Comments still open at document approval | 0 | any |
| Reviewer response overdue rate | rare, chased same-day | discovered at transmittal deadline |
If you cannot produce these numbers for your current project, that itself is the finding: a spreadsheet-and-email process doesn't record the timestamps needed to measure them. The review codes referenced here are explained in Document Review Codes Explained.
Analyses of slow review processes keep finding the same four sinks:
1. Waiting, not reviewing. The review sits in a queue or an inbox for days before anyone opens it. Elapsed time ≠ effort time.
2. Consolidation. Merging three reviewers' marked-up copies into one comment sheet is unpaid project management that happens every cycle — and it produces the version conflicts we describe in 7 Mistakes You're Making with Manual CRS Workflows.
3. Ambiguous comments. "Clarify section 4" costs a full round trip just to find out what the reviewer meant. Comments written as verifiable requirements resolve in one pass.
4. Re-reviewing from scratch. Without a comment-by-comment record carried between revisions, Rev C receives new comments contradicting what was agreed on Rev B — the single most demoralizing time sink in the process.
Every one of the benchmarks above falls out automatically when comments live in a structured system instead of loose files. Contrat.io tracks comment age, closure time, open counts per document, and overdue reviews as a by-product of running the review itself — and it eliminates the consolidation step entirely, because reviewers work in one shared workspace. Try it free for 30 days, no credit card required, and compare your next review cycle against the benchmarks in this article.