I came to Canada as a Temporary Worker on 18/Jun/2008 and got the PR on 05/Aug/2011 .
Now
1) How many days before the PR will be counted . I knew it is half day of each day before the PR . But Is CIC can count all the half days of three years of earlier my PR status .
They only look at the period of the 4 years before you apply. In order to have 1095 days in Canada in that period, because PR days count as half, the earliest you can apply is 2 years after getting PR. Then you would have, if you never left Canada, 730 days as a PR and the 2 years before that if you never left, 730 days that count as half so 1095 total.