4 months... must be a joke. It is probably just a warning to the other exchange and casino owners.  (and theymos lol)

"Do as we say or else we can mess you up in ways you can't even imagine. Don't f with us."

CZ and the Feds came to an agreement it seems but they couldn't let him go without a punishment because it would leave a bad image on the Feds. So they come with this joke-like sentence. I don't even believe CZ will do his time like the other prisoners. His punishment will be a vacation in a 5 star hotel for 4 months probably. Imagine 4 months in a hotel, I would go insane. Poor CZ.

It looks very orchestrated.