Boundaries Are About Neither Extreme, Continuing the Way Things Are

Boundaries are about neither extreme, continuing the way things are and feeling unseen verses simply turning our on someone, cutting them off. For example, if we've felt that someone ambushed us, ambushes us, and then the starts onlon rambling discourses about frustrating issues in their life. But when its are turned to speak when we need their attention, they might not be available. They might show disinterest or interrupt. So how can i set boundaries? How much time can i pick and choose when i make myself available and be very clear how much time i can offer? Can i state this feeling of an balance? And now the second, altogether more enjoyable of these two practices