I don't know this real or unreal. Someone played in Chronos can verify this info.
http://boards.lineage2.com/showthread.php?t=231093

If L2 NA begin ban bot, how much time will be ban per account ?

Looks like thread got moved/deleted. I think it was the one asking why lots of ppl in an ally got banned? If that's the case, it's because they were exploiting a bug on the Spezion instance, they did it 100+ times without regard of the /instancezone, rumors says they only got 7-day bans.