Yeah, 3-4 years after getting PR normally.
If you land as a PR already and never leave for a day for 3 years, you can apply right away after 3 years. If you take vacations outside Canada, you'd have to add that time.
If you were already in Canada on a student visa or temporary work permit for 2 or more years before you got PR, you would be able to apply 2 years after getting PR, again if you had left Canada, you would have to add that time.
The 13 months is the average processing time for citizenship. You could get it faster or slower. I got mine in August and it took me 2.5 years just the processing.