Chapter estimations based on LN.
I'm guessing at least 2 chapters before they get out. The next chapter will have a lot of fighting but end with the guys from the hunter's association showing up and be surprised of the power. Then in the middle of the chapter after that they will get out, and it will end in front of the hunter's association with a press conference for another hunter. Though it also wouldn't surprise me if they need another chapter of fighting in there somewhere. EDIT: Reread the LN, and I don't think they will get out until the 3rd chapter from now. The next chapter will probably end with the Shaman putting curses on the MC.