Do not worry. ATIP is your right. CO may not be bothered by it. Do not keep on requesting again and again. Doing it once or twice in the entire processing time is ok. Do not become a compulsive ATIP requester.
There is no reason to do the ATIP application for personal records so early in the process unless you know there is something in your circumstances or history which is a potential problem. Even then, it is highly unlikely you would learn any useful information.
If you know of something in your circumstances or history which is a potential problem, far better resource would be a paid-for consultation with a lawyer, taking copies of all relevant documents to the lawyer (from your initial PR application to now), and engaging in a fully confidential consultation with the lawyer, focusing on those matters you have cause to think might be or cause a problem.
If you know of no reason to suspect cause for a problem: RELAX!. The timeline varies.
Really, the ATIP results will be largely if not entirely useless. Why not act like a citizen and avoid imposing unnecessary burdens on government services?