Back in November, I took a crack at a Pliny clone. Transferring the beer to the carboy brought alot of hop matter into the carboy (filter got stuck so I had to knock it a few times to loosen it up). After fermentation, I cooled and racked to a keg. In the keg I hit it with 3 oz a whole leaves in a carboy for almost two weeks.
The problem: the beer seemed just over-the-top grassy. I know most people say a week is the maximum time. Some say two weeks. I am guessing the issue wasn't the dry hopping, but perhaps the insane hop matter going into the carboy after the boiling, acting as "dry hops" almost?