Isn’t that about normal? They get about three or four months off and then start filming again.
It’s less than that. The show finishes it’s intital season mid May and resumes filming mid July. They’ve all but wrapped by this point, but there’s still post production to do, ADR and such. This is assuming there is no ‘secret scene’ that they’re keeping the wings. It’s nt as bad as a full day of filming, but it can wear on you. Figure two months, if that.
It’s even worse for teh writing staff and showrunners. I don’t think these two ever stop working, but they have a lot to do. Plus, it helps to have a script when you start filming.