Measurable movement in citation share typically appears at eight to sixteen weeks. Enquiry volume lags that. Revenue lags further by roughly the length of your sales cycle. Anyone promising results within thirty days is describing activity rather than outcomes.
Technical fixes can show faster if content was previously unretrievable — that is a discovery problem, not an authority problem.
Content and corroboration work is slower because it depends on third parties.
Agree a falsification test at the outset so 'too early to tell' has a defined expiry.