There is nothing that was ever stated that a sit is required for a ban to be handed out. It has been this way since the beginning of the community.
You say you knew it was coming, means it was deserved. You have done nothing here but create excuses for yourself. Grow up, man up, and take responsibility for your actions.
I would have also perma'd you in the same instance. Come back when you've grown up a bit.
If you want to appeal at a later point, I'd probably +1 it if it's obvious you had thought about what you have done wrong, however you've literally just pointed out what you did and tried to say it wasn't that bad. Not cool.
-1 to the unban, -1 to the reduced length.