How long does a dbz-zone chatango ban last?

Usually lasts one hour, but if you hacked, it is a permanent ban. It depends on what parts of the Xbox LIVE Terms of Use or Code of Conduct you violated and to what extreme was it violated. Also they...

well first it gives u three warings and then your banned for ever but if you do a quest on panfu and the next day you talk your un baned yay

If you get banned forever, you can never play again. If you get banned for a short time (when you try to log on again, it doesnt say youre banned forever) the ban is fifteen minutes.

24 hours, normally. You have to do several things for it to ban you perminately.

they depend on what you didminor are usually 24 hours