QUOTE(shawon2170 @ May 13 2013, 09:18 AM)
I want To rank a Site with 3 keywords which competition is high ..
Now my Q is how many hours i need to work per day to find this keywords in 1st page of google?
You have to work on all aspects of marketing that is SEO, SMO and as you said for those keywords competition is high then it will take some time approx 3 months.