Forever and ever. But don’t get too scared of it. The most important thing you have to remember is that it has only one way in. Daniil Charms is requested to spit fire only once a day and only under certain circumstances. Just like any other. A hard learned set of rules for them, and they have to stick to it if they want to be respected. In fact, the situation gets worse each time one of them wants to enter or leave their room, because it sometimes causes them to get upset for no reason. That's because of their disease : sometimes their eyes become red and they start staring at you like crazy.