I’m thinking we don’t see this start any earlier than February 19th. Unlike Peacemaker, this will be airing on HBO’s broadcast channel, meaning that counter-programming will be considered. The Super Bowl is February 12th, and I don’t think they’re going to want to lose some eyeballs against that.
Normally, I’d have said that HBO also have to worry about going up against The Oscars on March 12th. But since award shows are no longer the big draw they once were, I don’t think they’ll worry about that.