my senior say new website means it take long days to bring good ranking position how many days maximum it takes ?
That's like asking how long is a piece of string... Depends on competition. Local business sites can potentially be ranked in a couple of weeks, national/international sites might take months or years.
It is not as easy as one can expect. Depending on the competition for that particular theme and resultant from your work which is done by you or any agency.
thanks ....when clients ask me how many days it will take to bring website in good ranking means what i will reply ..?
It depends on many factors. But the most important is what is its keyword that you would be targeting and what is the Competition for it. If the Keyword that you look forward to promote is very competitive then it could also take 6-9 months (even a year) to get on top of the search results. But if the Keyword is less competitive then it would take lesser time.
Quite honestly, to get top ranking for your website would depend on many factors. Again for some keywords, you can get top rankings in a week or two and for some it might take months. You can judge your competition by finding out the number of back-links to your competitor's website. There are free tool such as Traffic Travis, SEO Spy Glass which can help you to find backlinks to any website.