I have a dubbel with Brett L and it took 5 months for it to drink about perfect. It wasn't until I removed it from the kegerator in my outdoor cookhouse for a few weeks to make room for other stuff and let it go up and down in temperature with the outside weather that it fully developed. Kind of makes me think that Brett or at least Brett L likes temperature changes. It was back in March and the temperature swings here in TN were between 30F-70F for those few weeks. Its unknown if it just needed more time or was it temp changes that helped it develop. This was brewed on 11/4/2012.