RTI , Timeline

I have filed an RTI with respect to a family matter to obtain statement of my wife and my father recorded at local police station. Juridisction is Mumbai. I sent the appication on 4th August which reached concerned PIO on 6th aaug 2016. I have requested to recieve the certified copies on my residential address via speed post. Please let me know when I can expect them? By 6th September at least?