The answer in a few words – you can stop SEO at any time, but we think you will not want to.
SEO is an ongoing process in which your site gains a reputation and advances in search results. If you decide to quit you will not disappear from the search page within a day. The optimization we do on your website is not going to go away.
Our experience shows that organic website optimization is the most effective long-term channel of marketing, and we are certain you will not want to stop a campaign that has already reached results.