How Long an Enterprise Security Review Actually Takes
How long does an enterprise security review take for an AI vendor? Weeks to months. Here is what drives the timeline and how to cut it in half with preparation.
An enterprise security review takes anywhere from two weeks to four months, and the range is almost entirely on you, not the buyer. A prepared vendor with clean artifacts clears review in weeks. An unprepared one, answering each question from scratch and discovering gaps mid-process, drags it out for a quarter. If you are forecasting a deal, the security review is the single most underestimated line in your timeline. Here is what drives it and how to compress it.
The lever is preparation done before the review starts, not effort during it.
What actually happens during a security review
A security review is the buyer's risk team confirming you will not become their breach. It runs in rough stages: they send a questionnaire, you answer it, they read your answers and pull your reports, they send follow-up questions, then legal negotiates the contract terms that flow from all of it.
Each stage has a handoff, and handoffs are where time dies. You take a week to return the questionnaire. They take a week to review it. A follow-up question waits three days for your engineer to answer. None of these gaps are review work. They are waiting. Cut the waiting and you cut the timeline, which is the same reason enterprise deals stall in review even when the product is fine.
What makes a review drag for months
Reviews stretch out for predictable reasons.
You answer from scratch. No prepared library means every questionnaire is a writing project, and a several-hundred-question SIG takes you days you did not budget.
You discover gaps mid-review. The questionnaire asks something you have not built, so now you are building it during the sales cycle. This is the worst case, and it is common for AI vendors who shipped fast and skipped the boring controls.
Your artifacts do not exist. No SOC 2, no pen test, no data flow diagram means the buyer has to extract everything by interrogation, which is slow for both sides. Having the artifacts ready is why SOC 2 matters for enterprise sales.
Nobody owns it on your side. If security questions bounce between your sales rep and a busy engineer, every answer lags. One owner who knows the system answers same-day.
The buyer has no owner either. Sometimes the delay is theirs, a champion who cannot get the risk team to prioritize. Knowing who approves the purchase tells you whether the holdup is yours to fix or theirs.
How to cut the timeline in half
Everything that shortens a review happens before it starts.
Keep a completed security questionnaire on the shelf, answered honestly, in a reusable library. When the buyer's spreadsheet arrives, you are mapping known answers, not writing new ones. This is the whole game behind answering the security questionnaire fast.
Publish a trust page with your reports, data flow, and subprocessor list so the buyer pulls answers instead of asking. Every question they self-serve is a handoff you skipped.
Staff one owner who can answer both the paperwork and the architecture live. When a follow-up lands, it gets answered that day, not next week.
Fix your gaps before you sell, not during. If you know a regulated buyer will ask for encryption at rest and you do not have it, build it now. Discovering it mid-deal is how a two-week review becomes a two-month one.
Set the buyer's expectation, and yours
Tell the buyer up front how you handle security review and hand them the artifacts on the first call. It signals maturity, and it moves work earlier in the cycle where it does the least damage to your close date. A vendor who leads with the trust page reads as safer than one who scrambles when asked, which is exactly how enterprise assurance wins deals.
Forecast honestly on your own side too. If you tell your team a regulated deal closes in 30 days and the security review alone takes 45, you have set everyone up to miss. When I run infrastructure I control on HostSSH, the data-handling answers are already true and already written, which is why my reviews move fast. The timeline is not fixed by the buyer. It is set by how much you did before they asked.