Not sure, about length of ban, but write an appeal in the gaming section, if you make a new post its more likely to be seen. I'm not sure who has admin for the servers (they are deciding on some new admins at the moment), but Jim defiantly is.
- edit - no i can't say that anyone who has been banned on those is defiantly not a hacker, but i know a couple of people who seem the best of types being banned by similar lists. Also, if you demo someone for long enough, its easy to find a few kills that look like dodgy, and can be attributed to a charged trigger bot or similar, and on calls like that, i'm sure some will slip through the net