Well - Hopefully the man himself will be along, so you can have it from the horse's mouth. It's his beer, so probably do that!
For my own beers, if it's leaf hops in a hop sock, then a good few days (maybe a week). I tend to do it in a secondary bucket, unless I'm being lazy. I've blitzed them a bit first in a blender before too. I used Galaxy pellets (loose) instead on my own recipe last time and have used EKG pellets before too. Pellets often take up to a week to fully sink anyway, by which time I've chilled it down. I prefer pellets and have had much stronger results with them so far vs leaf hops for dry hopping.
Whatever you do, I think temperature is a factor as well as time, so maybe Dennis can divulge that too!
