So here is the procedure: Ottawa is taking about a month or less to return passports, and once you get your passport back, you will receive COPR document with it. That document has to be signed by immigration/CBSA officer to finish landing protocols. While being in Canada, you have three choices to do that:
1) telephone landing: new project recently opened to do it over phone and mailing. Only certain people are chosen and being emailed or called.
2) you can do the flagpolling at US/Canada border through car. It's probably the fastest among others, though you get administrative refusal from US official if you don't have US visa. It is just part of the protocol. People often do this.
3) or you can call the CIC call agent to book appointment at regional/local CIC office.
Once COPR is signed, you will get PR card in about 45-60 days. Then and only, it is recommended to leave Canada for travel.
You can stay in India for 6 months after all of this is done, as long as your are meeting the following requirements to keep your PR status active: please read the following link to know how long you have to stay in Canada without losing your PR status: http://www.cic.gc.ca/english/helpcentre/answer.asp?qnum=727&top=4
Hope it helps
