Hello @_FyRo,
The duration of bans depends according to the rule "§2.8 - How bans are issued".
Permanent bans can only be issued for violations of the rule "§2.1 - Hacking/Bug/Feature abusing" or according to the rule "§2.9 - Bans issued by the Game Moderation Management" the Game Moderation Management has the permissions to change the ban permanently.
I will leave to below this rule on how the ban durations are handled.
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§2.8 - How bans are issued
• The first 3 bans are issued at the staff member’s discretion.
• The 4th ban is thirty days.
• The 5th ban and consecutive bans are ninety days.
•• Any bans older than 12 months at the time of the new ban being issued are ignored, this 12 month period is the ban cooling-off period. Ban extensions are based on the active (less than 12 months old) bans at the time of expiration and will not be altered if a ban goes over the 12 month period while the ban is active. If you have at least two active history bans in your ban history, staff will extend your next ban to a ninety days ban, regardless of how many bans you have had in the last year. Bans that are extended due to history cannot be removed, they are strictly thirty days and ninety days.
[...]
You can find the all of rules here.
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Unfortunately, you cannot see the ban durations of users whose punishment history is not public. Even if that user is permanently banned or temporarily banned, you will not know because their punishment history is private. Or you won't know until he says you.
Feel free to let us know if there is anything else we can help you with.
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Best Regards.