How long get to know result from Imperial

Hi everyone,

I got Skype interview Strategic Marketing at Imperial today.
How long does it take to let me know result get offer or not. How many percent that could get offer.
I really want to get into but I feel I speak not very well. TT_TT

I hope I get an offer... I feel like I stuttered too much during the interview so I might not get it

Haha I got it guys!