Yeah, for my previous jobs I've heard within a couple of days. One actually called me while I was driving home from the interview. When the wait has been this long though it's not usually been good news.
For context, I had an interview on Tuesday 16th and they said it I probably won't hear anything "before Friday week" due to being one of the first interviewed and it being difficult to find times that suit the three managers to do the interviews etc. Now Friday week has passed I'm just wondering whether there is any point getting in touch with them to ask for an update, or just let it go.