How long does AEO take? When AI answers change after you fix schema and content gaps

Per engine

Which AI engines update fastest after a fix?

Engines that search the web while answering, such as Perplexity and ChatGPT with search, reflect changes fastest, Google AI Overviews and AI Mode follow Google's slower crawl and index cycle, and answers drawn from a model's training data can lag by months or a whole model release.

Each engine finds your changes a different way, so each moves on its own clock. The official documentation only gives timings for robots.txt changes and for Google’s crawling, so the last column is what we saw on our own site, for fixes shipped 17 to 24 August and tracked to 21 September 2026.

ChatGPT only searches the web for some questions. Semrush’s US clickstream data found it switched web search on for 34.5% of queries in February 2026 (Semrush); the rest are answered without a search, from what the model already knows, which moves on model-release timescales rather than weeks.

The mechanism

Why does it take weeks rather than days?

AI engines have to re-crawl your pages, re-index them, and then see your brand described the same way across enough independent sources before they will repeat it, and each of those steps runs on a schedule you do not control.

Why crawling and re-indexing set the floor (days 1 to 14)

Nothing changes in an answer until a crawler has read the new version of your page. OpenAI and Perplexity say robots.txt changes reach their search systems within about 24 hours (OpenAI, Perplexity); Google says crawling can take anywhere from a few days to a few weeks, and several months in some cases (Google recrawl guide, Google AI features guide). AI crawlers also waste a lot of their visits: in Vercel and MERJ’s December 2024 analysis, ChatGPT spent 34.82% of its fetches on pages that returned a 404, and none of the major AI crawlers except Gemini, which runs on Googlebot, rendered JavaScript (Vercel and MERJ). Content that only appears after scripts run is invisible to them. More on the crawlers in the glossary under AI crawler.

Why retrieval-based engines move before training-based ones

Engines that search the web while answering can use your new page the next time the question is asked. Answers drawn from a model’s training data cannot: they only change when the provider trains and releases a new model. On our own site, every first mention came from an engine that searches the web while answering.

Why do third-party mentions take the longest?

Because the engines repeat what many independent sources agree on, and getting reviews, listings and articles on other people's sites takes weeks of outreach and publishing that you cannot rush.

Ahrefs’ study of 75,000 brands, published in May 2025, found branded web mentions correlated with visibility in Google AI Overviews at 0.664, against 0.218 for backlinks (Ahrefs). The difference between a brand mention and a citation is explained in the glossary, along with citation rate.

Before the mentions

How to tell whether it is working before the mentions arrive

Track leading signs weekly: AI crawler visits in your server logs, your pages cited as sources even when your brand is not named, and whether the engines describe your business more accurately than before.

When we asked one buyer question 20 times each on ChatGPT and Gemini, no two of the 40 answers named the same set of brands (AEOscore). A single answer tells you almost nothing; the share of weekly answers that name you tells you whether the fix worked.

“One mention is a coin toss. A mention you see in most weekly scans is a result.”

The plan

A 12-week plan

Judge at week eight and decide at week twelve, using the mention rate across weekly scans rather than any single answer, because AI answers vary from one run to the next.

If you do not know which of these your site needs, start with the question behind them: why ChatGPT does not recommend your business covers the five usual reasons.

FAQ

How long AEO takes: common questions

>What moves AI mentions within 12 weeks?

Making your content readable in plain HTML, answering real buyer questions directly on the page, keeping your name and description identical everywhere, and earning fresh third-party mentions on the sites AI engines already cite.

>Why did my mentions improve and then disappear again?

AI answers are regenerated each time and vary between sessions, models and regions. Track the mention rate across several weeks rather than reacting to one answer.

>Will publishing more content speed it up?

Not on its own. The engines repeat what many independent sources agree on, so in our experience a few mentions on sites the engines already cite do more for a settled question than extra pages on your own site.

>How long do answers from a model's training data take to change?

Training-data answers change only when the provider trains and releases a new model, on its own schedule and usually months apart, so plan around the live-search answers and treat training-data movement as a bonus.

>Do AI Overviews update as fast as normal Google results?

They draw on the same index, so a page has to be crawled, indexed and eligible for a snippet first, which Google says can take several days to several months, and in our own tracking AI Overviews moved weeks after ChatGPT and Perplexity.

>How long does it take with AEOscore?

AEOscore scans weekly on Monitor (£99 a month) and daily on Monitor + Strategist (£1,495 a month), and re-checks every shipped fix at 7 and 28 days, so you see movement as it happens; on Monitor + Strategist an in-house strategist and developer makes the fixes, so they go live the same month.