how long do you ferment beer
Subscriber Beer Trader. Depends on what your primary fermenter.. Buckets being the worse, better bottles, and then glass carboys. Then maybe if you are serious about it, a SS conical, but not a ton of people use them. As a whole, I try not to leave them in longer than 2 weeks after fermentation is done. Life gets in the way, and I haven't had them get worse, obviously keeping them fresh for a hoppy beer is best. #2 Apr 14, 2014.