This site states this specific figure directly: the brand describes visible changes in skin, hair and nails within a few weeks of consistent use.
Worth reading "a few weeks" as the earliest checkpoint this site names, distinct from the fuller 6-month window it separately recommends for the most consistent, long-lasting results.
C. Marlowe's featured quote specifically describes noticing less nail chipping "a few weeks in" — worth reading that individual account as consistent with this site's own stated early-timeline figure.