Twelve pages currently answer this question with a timeline. Ten of them sell the service whose duration they are estimating, and not one of those ten cites a source for the number it gives you.
That number, three to six months, has turned up in nearly every content audit that crosses our desk at Lexicon Legal Content, and we have never found the study behind it. There is no study. It is a retainer length, not a finding.
There is no waiting period: a law firm page becomes eligible for AI citation as soon as it is indexed, not after a fixed number of months.
The three to six month figure repeated across the pages ranking for this question is a retainer length, not a research finding.
Nobody Ranking for This Question Sources Their Answer
The three-to-six-month figure traces back to nothing. MarGen quotes three to six months, with compounding results from six to twelve, on a page selling packages that run £2,950 to £12,950 per month, and that page carries no citations at all. RankBrain puts first citation at 30 to 45 days while selling retainers of $2,500 to $10,000.
Site Your Case and Argota repeat the same three-to-six-then-six-to-twelve ladder, also unsourced, and both sell law firm SEO. Only Semrush and DerivateX cite anything, and DerivateX is citing Semrush.
The ladder is inherited from pre-AI SEO retainer copy, which is where those durations have always come from. If you are deciding where a small budget goes, the duration you are quoted is the product being sold, not evidence about the product.
There Is No Waiting Period, and Both Platforms Say So
Eligibility is immediate. OpenAI’s publisher documentation states that any public website can appear in ChatGPT search, and Google’s guidance on AI features says there are no additional technical requirements and no special schema markup needed to qualify.
Neither company names a minimum site age, an authority score, or a traffic threshold. Google’s actual condition is narrower and far more practical than tenure: the page must be indexed and eligible to be shown in Google Search with a snippet.
So the question to ask is not how long you wait. It is whether you are indexed, and after that, whether the page does what engines actually weigh when they choose a source to quote.
Crawled, Indexed, and Cited Are Three Different Events
Most timeline advice collapses three separate events into one number. A page has to be crawled, then indexed, then selected as a citation, and only the first of those three has any published guidance attached to it.
Crawling alone can take anywhere from a few days to a few weeks, a range Google publishes in its instructions for recrawling your URLs, which also warn that requesting a crawl does not guarantee that inclusion in search results will happen instantly or even at all.
Perplexity documents its crawlers but publishes no crawl frequency and no citation eligibility rules. OpenAI publishes no refresh frequency at all. Any single number covering all three events is filling two gaps the platforms themselves have left open.
The One Real Experiment Found Something Faster and Less Stable Than Anyone Is Selling
The only controlled test on record found first citation far faster than the sales copy claims, and retention far worse. Semrush published 81 FAQ-style pages and queried both engines daily for 30 days.
Google AI Mode cited 29 of the 81 pages, 36 percent, the day after publication, and 45 pages, 56 percent, by day seven. By day 30, only 21 pages, 26 percent, were still being cited. ChatGPT moved in the opposite direction, starting at 8 pages on day one and climbing to 34, or 42 percent, by day 30.
Semrush read its own Google numbers this way: the engine seems to be continuously re-evaluating which sources to cite, adding and removing pages from its pool of trusted sources on an almost daily basis.
The caveat matters as much as the finding. Semrush ran this on its own blog and wrote that the pages were given the best possible conditions to succeed, which makes it a measurement of new pages on an already-authoritative domain. It does not measure a new firm’s new site, and no published study does.
Appearing Once Is Not Arriving
Holding a citation is a different problem from earning one, and it is the deeper reason any single date is the wrong thing to ask for. Kevin Indig’s July 2026 analysis of 1,094 categories and more than 600,000 citations found the leading source switched in 1,950 of 5,470 month-over-month comparisons.
Where an entrenched owner exists, the picture reverses. A clear owner held first place in 90.4 percent of those comparisons, and the difference sits in the margin: categories that changed hands had a median lead of 1.3 points, against 2.9 points for the ones that held.
For a small firm, the opening is not displacing an owner. It is the narrow-margin categories, and in legal specifically Indig found no clear owners at all, which is why whether a solo can compete turns on turnover rather than firm size.
Frequently Asked Questions
How long does it take for a law firm to show up in ChatGPT?
No vendor timeline survives checking, so build your own baseline instead. Record which prompts name your firm today, then re-run those same prompts monthly. Movement on that list is the only date worth tracking.
Do I need to wait until my site has authority before AI will cite it?
No. Neither platform publishes an authority threshold or a minimum site age. What decides a citation is whether the page answers the question in a passage an engine can lift, and a new site can do that immediately.
Why did my firm appear in an AI answer once and then disappear?
One appearance is a sample of one query on one day. Re-run the same prompt several times, and across more than one engine, before drawing a conclusion, since results shift between sessions even when nothing on your site changed.
Is AI search optimization different from SEO?
Less than vendors suggest. Both depend on indexation and on answering clearly. The working difference is that AI answers quote passages rather than rank pages, so self-contained paragraphs matter more than keyword placement does.
Want the Version of This With Your Own Pages in It?
Ask us which of your pages an engine can currently quote, and we will tell you what is blocking the ones that cannot be. Every piece we deliver at Lexicon Legal Content is checked back to its primary source before it leaves us, then reviewed by a licensed attorney admitted in Missouri and Illinois.
Call 877-486-8123 or contact us online and ask for the citation check.
David Arato, JD is the founder of Lexicon Legal Content, an attorney-owned legal content marketing agency serving law firms since 2012. He has watched law firms buy timelines rather than outcomes for most of that period, and built Lexicon’s research process around tracing every number back to its primary source. David is a frequent contributor to Attorney at Law Magazine and Attorney at Work and a recurring guest on legal marketing podcasts.
