If it doesn't say a specific ban duration (e.g. Temporarily banned from server for 2 hours) when you attempt to log in, then it's a permanent ban and you will have to fill out the ban appeal form.

 

Please use the correct Ban Appeal format.

1. Server name (.net / .org ):
2. In-game name:
3. Full exact Ban Message:
4. Did you read the rules ?
5. Why do YOU think you were banned?
6. Was this an incorrect ban?
7. Were you ever banned before on SkyBlock? If so, what for?
8. Why do you think you should be unbanned?

You have three days to fulfill this requirement. Failure to correct the format will result in the appeal being automatically denied.