I can make your clients website visible through SEO, but the timeframe could be anywhere from a few days to months, depending on the state of the current website, backlinks, DA & PA, domain age and keywords.
Iff you only have general single keywords or high search phrases, there isn't much chance to rank for these any time soon, they would take a considerable amount of work.
However, if you are after low competition long-tail keyphrases, that would be different and I could have the site on first page in a few weeks.
I would like to get a bit more information about this job, so please send me a message so we can have a good talk about what you need done.
Thank you for your time,
Daniel