I also had to wait for police cert (not India though). After the first 30 days I sent CIC a part of requested docs via email, explained that I am waiting for PCC to be received and translated (had to contact embassies to get some of them) and asked for 30 day extension. In response, the Missisauga office sent me another instruction letter with the list of outstanding docs and new and last deadline, in 30 days. So I would send what you have and request time you need. If its 45 days with translations, explain why you need that long and request it upfront.
@ramko