I don't have mine till after January as I've got exams on now so couldn't make any of the interview dates. But one of my friends went to the first round on Monday and got the rejection yesterday if that gives you any indication of timescale.Obviously I have nothing to back up my opinion on interview performance, and I guess it really all depends on what (you think) went badly/well, but I would imagine that McK being as selective as they are will only take an overall good performance. But as I said who knows till you get the result, and at least you get pretty comprehensive feedback if it is a negative.Best of luck.