ow Long does it take to apply for Canadian PR. 
you can immediately apply, it may take two or three days to reach buffalo if you are in USA or canada

 I'm Currently Doing MBA Does it Gurantee Canadian PR.
no there are may other factor to guarentee canadian PR, otherwise all the people doing MBA would be canadian PR

I got work Experience too.
this is one of the necessary criteria, you should have atleas one year of full time or equivalent part time WE

for details check www.cic.gc.ca