I just finished a keg of this. I rushed it at the start, because I wanted to have it ready for my Dad's 60th bday part. I had it kegged and ready to drink at 13 days, and it wasn't anything spectacular, but I was kinda expecting that anyway.
After the party there was about a 1/3 of the keg left, so I brought it home and let it sit in my keezer. I let it sit another week and a half, and wow! The beer definitely matured, and only got better the longer I let it sit. Next time I do this recipe, I am going to do it right and let it sit for a few weeks. I would rather have 5 gal of deliciousness rather than 1.6 (repeating of course).