After my higher studies can i apply for poland PR (Permanannt recidency) ?
in short No!
If not a EU EEC citizen then you will need a visa (and as you will have finished studying you will need a different visa to a student one) .. you will need to provide proof that you can sustain yourself financially in Poland (so you will need to show your bank statements stating you have xx amount of savings that you can live off so not claiming benefits) and if you haven't you need to be in employment in Poland preferably before a visa will even be contemplated to be issued.
A Residence Permit will only be given after 5 years of living in Poland as as visa's arent issued for that long for what i am lead to believe ... it isnt as simple as you seem to think!
And how long it will take ?
How long is a piece of string?