I've been quite busy lately (started new business) and left two 5-gal cornies dryhopping for over 5 months. The recipe was Denny's Rye IPA and it was dryhopped w/ Columbus pellets. The beer was out in my partially insulated, unheated shop and subjected to local temperature swings. I just kegged it yesterday and, amazingly enough, it tastes fine. Of course, it's also very clear and that beautiful golden amber color. I'll be seriously sampling this beer with friends over the Memorial Day weekend and I'll report back the final result. I was surprised to find this beer even drinkable, much less tasting as good as it seems.
This has me wondering about all the posts I've read warning of grassy, or vegetal, off flavors after prolonged dryhopping. Maybe it's the pellets (I mostly use whole leaf, but rarely find Columbus whole), or the Columbus or a combination of both.