Definition
Time to first citation (TTFC) is the elapsed time between publishing a page and its first appearance as a cited source in an AI-generated answer. It is the AI counterpart to time-to-index in traditional SEO, and it answers a question every content team asks: how long before this work starts showing up?
Published analyses of page cohorts put the median in the range of roughly a week, with a long tail—a meaningful share of pages take a month or more, and many are never cited at all. The distribution is heavily skewed, so medians and percentiles are far more informative than averages here. Reporting a mean TTFC lets a handful of slow pages distort the whole picture.
TTFC decomposes into stages you can act on separately: crawl (an AI crawler fetches the page), index (the content enters a retrievable store), retrieval (it surfaces for a relevant query), and selection (the engine chooses to cite it). Crawler log analysis isolates the first stage, so a page sitting uncrawled for two weeks is a discovery problem—internal linking, sitemaps, IndexNow—while a page crawled on day one but uncited on day thirty is a content or authority problem.
The metric is only meaningful measured across cohorts. Individual pages vary enormously with topic competitiveness, site authority, and how often the relevant prompts are asked. Track publication batches over time instead, and use shifts in the cohort median to tell whether technical changes actually accelerated pickup.
Examples of Time to First Citation
- A publisher tracks each month's new pages as a cohort and reports the median days to first citation rather than a single average.
- A page crawled within hours but uncited after six weeks points to a content quality or authority gap, not a discovery problem.
- A team cuts cohort median TTFC after adding new articles to the sitemap and strengthening internal links from high-traffic pages.
- An analyst reports the 90th percentile alongside the median because a long tail of pages takes over a month to earn a first citation.
