I have never carbed in a grower, but....I have had beer stay "good" in growlers for 4-6 weeks (they may make it longer, but I haven't had one stick around that long).
Title says it! A friend of mind from college got into homebrewing a few months ago. He came back to visit and brought some of his beer. I purchased the recent Midwest Brewing groupon, I have gotten started and love it.
Currently in 2nd stage is an Irish Stout
And on the way is "Chocolate...