I'd have to agree with progmac here. The krausen tends to stick around a little longer on my beers, but I tend to ferment in the 60-63 range. That puppy's above 9%.
What temp is your ferment? What kind of yeast? Did you use a starter? That's a pretty big beer. My guess is it will take a couple of weeks to ferment all the way.
I completely agree about the choices around here. I swear people's tasebuds are completely fried in these parts. I can't even find a porter that isn't bitter hopped to the moon. Good luck with the ESB and all your future brews. :mug:
I've tried carbing for two weeks and found no difference(to me) in the outcome. I usually do my primary for 3-4 weeks. I also have found that if I need to "age" my beers in the keg, it's because I missed a flavor profile in my recipe, and I'm hoping it mellows out.