If there isn't a time specified on the ban, then I believe it's a permanent ban. You probably get some points in your favor for being honest, though you probably also lose some by succumbing to the constantly-roll-my-eyes-and-bring-up-other-users way of presenting your psuedo-ban appeal. That's a loooot of farm accounts though, it seems to me like this was a massive amount of spam being made if you had that many accounts banned. I'm also guessing you use Tor or a proxy if you had to pay a units of evil fee...? Or it could be previous bans on that IP.