It's worth noting you don't even have to freeze it. Spread it out onto a sheet of plastic wrap or wax paper or something, let it dry, crumble it into flakes and

It's worth noting you don't even have to freeze it. Spread it out onto a sheet of plastic wrap or wax paper or something, let it dry, crumble it into flakes and store somewhere dry and a temp-stable. I've reconstituted starter from flakes like this at least 6 months out and I'd be willing to bet it'd work at much longer timescales.