All bans last for 500 years. If you wish to appeal a ban, you can do so at the below link. You should note that there is no guarantee you will get a response. If you don't get one after 30 working days, then it's very likely Bungie decided your ban was correctly placed.
https://help.bungie.net/hc/en-us/articles/360049024492-Contact-Form-Appeal-Ban-or-Restriction
You cannot appeal a ban in the public forums, and nobody can help you in the public forums either.
[spoiler]Just looked at your history and it's definitely suspect. I can see a see why Bungie may have revoked your access to this game.
No legit player has a K/D as high as yours and has that amount of wins without a single loss. [/spoiler]
[spoiler]Also, did more digging. The clan you’re in is filled with players with very suspicious game histories.
Thanks for posting. [/spoiler]
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Woah. Spooky.