The answer is 7 and a half.
Edit: On a more serious note, your ambiguous story about a person that really isn't a person but really is a person that may or may not be hacking is confusing and doesn't actually tell us anything. Not to mention your use of random paragraph breaks just hurts my head.
Yes, it's hard to catch toggling hackers, but with our policy on hacking bans we're not going to ban fishy players without proof. More often than not, they're just good players. We do have one loophole, if an admin determines that the player is disrupting server play or creating a hostile environment, a ban would an acceptable course of action. Obviously, disrupting the server is not necessarily a permanent ban-worthy offense, but that's always up to the admin's discretion.