As long as they want it to.
As long as the mod wishes.
As long as they want it to.
The ban lasts until a mod unbans you.
24 hours, normally. You have to do several things for it to ban you perminately.
It last one hour.
1 week
1 month
Usually forever.
Roblox has made it so that you can no longer buy the ban hammer.
An IP ban on Roblox lasts 1 week for the first time. If the person continues to break the rules, the ban becomes permanent.
"Permanent" means forever.