I probably change mine once or twice a month, but I've been chained to this bey one since it's run. It's the avi curse - Doc has it as well. When you've got that one avatar everyone recognizes you for, and people chastise you when you change it
Changed mine a few weeks ago. I'll probably keep it another month or two. I would've kept the P!nk avi forever, but Janelle's sudden release and perfect music video were too much to resist!