That's close and depends on how fancy the haircut is..
I can say we have been multiple times during the most busiest time of the year, Xmas, and it was never busy and we always got there and was finished prior to our scheduled time. One time was just a walk up and we sat right down..
I would just do that. Get there early... R,ember to take cash as you have to have cash to tip, at least that's how it was when we went. I didn't have any so I just swung by on our next MK day to pay the ladies.