For how long can I freeze cake batter?
I have never froze cake batter but I have froze baked cakes. Have you considered doing that? Some cakes (like chocolate) taste better after they have been frozen. I keep my frozen for about a month. It probably can frozen longer, I just end up using them by then.
Yes, you can freeze cake batter. I have done it myself with no problem. I do let it thaw and come to room temperature before I bake it though.