Some cranberry melomel I started in early December(Dec10) is still rolling along. It did go dormant for a couple weeks while I had my AC off (vacation) though. So i guess that makes four weeks and counting of bubbles. However my take on the JAOM (apples instead of oranges) that I started the week before that one was done and cleared a couple days ago.
I keep my house at the same temp or lower, so that might have something to do with it. The yeasts can't get too furious in there... I figure the baker's yeast might not be a very precise strain like brewer's yeasts are, so we both might have some super tolerant yeasts going on as well. That's my best guess, I'm no expert.