The microbiome responds quickly: a sudden dietary change can alter its composition within a few days. However, these changes are temporary unless maintained. Lasting change requires consistent habits over weeks or months; if you return to your previous habits, the microbiome tends to return to its previous state.
If you want to see how your microbiome has responded to a sustained change, it therefore makes more sense to repeat the test after a few months, under similar conditions, than after a few days. You can buy your next kit in our online shop.