Is it possible to optimize a website on a search engine in one day?

Yes, it is possible!

It depends!!

Guys be realistic. Nobody can get rank on google within one day and especially with one day old website by any technique.... But yes if you are ready to spend money then you can try for Google Adwords or Google Paid ads which will lead you on the top.

Its possible to optimize a website in just one day especially for a unique keyword target and its most likely happen to rank it faster compared to high competition keywords.