What is the expected release date from the hospital for 3 broken ribs and an arm with an open fracture?

A few days. Rib fractures are often indicators of chest wall trauma and may be associated with lung problems. Open fractures of the arm (humerus in the upper arm or the radius and ulna in the forearm) are treated with debridement & washing of the open wound and operative stabilization of the fracture(s), most commonly with a plate and screw construct.