I chased oxidation after kegging for several batches. It was intermittant and varied by individual kegs. It presented after two weeks in the keg as loss of hop aroma and then hop taste leaving just a nasty bitterness. The beer (lighter styles) would get noticeably darker as time progressed...
2nd year Cascades - 2.72 ounces. About 1/4 are quarter size or bigger. The rest are dime size or smaller. I have them drying in the utility room that does not have AC and has the hot water heater.