Unlike what I think I've seen here, most brews are bottle or keg conditioned. I've noticed, in the little time I've spent here, that some people leave their wine in a fermenter/carboy for a year or more. With beer, headroom isn't as important as wine. The headroom with beer is usually filled with CO2, unless you peek a lot. I've read that if beer sits too long on the "trub" it can develop off flavors and I usually get my beer bottled in three to four weeks. All of my beer fermenters have spigots so they can serve double duty - fermenting or bottling.