let me see if i can clarify your doubt... as i was confused by your questions itself LOL
OK so PCC is required for EVERY country where you have lived for more than 6 months accumulated, since the age of 18...
Country of residence - That is straight forward, PCC is valid for 6 months (unless stated otherwise in the document. For eg : UAE PCC is only valid for 3 months)
Home country or any other country - PCC Is valid ONLY till the time you visit that place again, let me give an example
I live in UAE, Indian citizen. So as you figured correctly UAE and Indian PCCs both are needed
I applied for UAE PCC from UAE itself, this is valid for 6 months (Actually its only 3, thats what it says on the document)
I applied for Indian PCC from UAE - Indian passport office. This PCC is valid for either 6 months, or TILL the time I visit india again... let me give you example for this
i goto india on vacation, come back on 31st dec 2016.
Applied for India PCC from UAE on 1st Jan 2017.
This PCC is valid till 30th June, 2017... OR till the time I goto india again... lets say for ex i goto India on 10th march, the PCC become invalid and a new PCC is needed.
You need to remember however, once you submit your e-APR and get AOR, after that you are free to travel wherever you go...
i hope that answered your questions