Four weeks ago i brewed up an Amarillo APA with an OG of about 1.060. I pitched a 1L starter of WL WLP001 and away it went. It was the most agressize fermentation I'd seen to date, with gobs of yeast and krausen pumping through the blow-off tube, and that's with a 6 gal. glass carboy, mind you. Things subsided after about a week, but now after four weeks I can still see the occasional bubble coming out of the airlock. One would have thought that with a starter and that aggressize of a fermentation it would have wrapped up sooner. For the record, I don't do secondary fermentation, I generally do a 3-week primary then bottle. It looks like I just have to wait this one out.