i think they would take 2-3 days at the most if you go into a genius bar.
In countries with no apple stores they take 2 days to diagnose if its a busy service centre and then further 3 days to get the parts and install it.
If you have a non retina macbook pro then the logic board will be changed, if its a retina they will change the headphone jack/cable or logic board depending on their diagnosis.