I start knocking back my beer when it has been on the keg for a week. However, it doesn't taste quite right until it hits the 3-4 week mark. Carbonation is fine, just flavor seems to be a little off... as the OP in the other thread puts it, "It gets better than 'good enough' after a few weeks." Nice thing about kegging is that you can more easily take small tastes along the way without wasting a bottle at a time. EDIT: I don't know the answer to your other question... I've never heard of that before.